Rest

Rest is the game mechanic that controls Characters' needs for sleep. A character with a higher rest value has slept recently, and is less tired than another character with a low rest level.

Levels of Rest

Characters' rest level is grouped into four thresholds: Rested, Tired, Very Tired, and Exhausted. Each threshold exhibits different effects on a character, especially their Thoughts. When a character's rest level is zero they may collapse from exhaustion; they will immediately begin sleeping on the ground wherever they are.

The rest levels are as follows:

Label	Rest	Mood Debuff
Rested	>= 28%	None
Drowsy	>=14% and <28%	−6
Tired	>=1% and <14%	−12
Exhausted	<=1%	−18

Rest caps at 0% and 100%.

Rest Changes

Negative

When awake, rest goes down every 150 ticks (1/400 of a game day) depending on the character's current rest.

	Threshold range	Rest change per 150 ticks	Rest change per game day	Real time in state^[1]	Game time in state^[2]	Real time since 100% rest^[3]	Game time since 100% rest^[4]
Rested	100% - 28%	0.237%	95%	45,474 ticks (12.63 mins)	18.189 hours	0 ticks (0 secs)	0 hours
Drowsy	28% - 14%	0.166%	66%	12,632 ticks (3.51 mins)	5.053 hours	45,474 ticks (12.63 mins)	18.189 hours
Tired	14% - 1%	0.071%	28%	27,368 ticks (7.6 mins)	10.947 hours	58,105 ticks (16.14 mins)	23.242 hours
Exhausted	1% - 0%	0.142%	57%	-	-	85,474 ticks (23.74 mins)	34.189 hours

↑ Real time spent in the state before crossing the lower threshold, assuming no rest is gained
↑ Game time spent in the state before crossing the lower threshold, assuming no rest is gained
↑ Real time spent before entering the state, assuming no rest is gained and the starting rest is 100%
↑ Game time spent before entering the state, assuming no rest is gained and the starting rest is 100%

Positive

When a character rests in a bed, their Rest value increases over time. At 100% Rest Effectiveness and 100% Rest Rate Multiplier, a character requires 10.5 hours (26,250 ticks) to full rest from 0% to 100%.

 Every 150 ticks (2.5 seconds at 1x speed), rest increases by 100% * (Ticks in interval (150) / Ticks Per Game Day (60000)) * (Hours per day (24) / Sleep Hours for Full (10.5)) * Rest Effectiveness * Rest Rate Multiplier
 = 100% * (150 * 24) / (60000 * 10.5) * Rest Effectiveness * Rest Rate Multiplier
 = (100%/175) * Rest Effectiveness * Rest Rate Multiplier
 = ~0.57143% * Rest Effectiveness * Rest Rate Multiplier

175 of these 150-tick intervals is the 26,250 ticks (10.5 in-game hours) required to fully rest from 0%.

Multipliers

Rest Rate Multiplier is a character (pawn) stat that defaults at 1.0 and is based off blood pumping, metabolism, and breathing capacities (and thus is affected by relevant injuries, bionics, etc.)

Blood Pumping has a .3 weight
Metabolism has a .3 weight
Breathing has a .3 weight

Rest Effectiveness depends on the object the character is sleeping on:

Object	Rest Effectiveness at Normal quality	Rest increase per 150 ticks	Rest increase per full 24-hour game day
Sleeping Spot or Ground	0.8	~0.45714%	~182.857%
Bedroll	0.95	~0.54286%	~217.143%
Bed	1.0	~0.57143%	~228.571%
Royal Bed	1.05	0.6%	240%

and the quality of that object:

Quality	Rest Effectiveness Multiplier
Awful	0.86
Poor	0.92
Normal	1.0
Good	1.08
Excellent	1.14
Masterwork	1.25
Legendary	1.6

Therefore, when a character with 100% Rest Rate Multiplier reaches the Tired threshold (28%), it takes them this long to return to full (100%) rest:

Object	Ticks to Full Rest	Hours to Full Rest	% of Day to Full Rest
Sleeping Spot / Ground (0.8)	23,625	‭9.45	39.375%
Normal Bed (1.0)	18,900	7.56	31.5%
Legendary Royal Bed (1.05 * 1.6 = 1.68)	11,250	4.5	18.75%

Analysis

There exists a balance point for every type/quality of bed (and character, if that character has offsets to Rest Rate Multiplier or Rest Fall Rate), in which the hours spent sleeping and the hours spent awake during a 24-hour period precisely balance. This is ultimately a piecewise equation, as the rest fall rate is piecewise based on the current rest level (see above). We can ignore the Exhausted category, as a character must spend >24 hours awake (if starting at 100% rest) before reaching that threshold.

As long as the character is awake for less than 18.189 hours per day, however, this is a single-part equation, as the character will never reach Tired. The percentage of the day that the character may stay awake, expressed as a decimal value, with a given RestMult (equal to Rest Effectiveness * Rest Rate Multiplier) is reached by solving the following equation for %DayAwake:

 0.95 * %DayAwake = (1 - %DayAwake) * (24/10.5) * RestMult

This gives the following equation:

 %DayAwake = (320 * RestMult) / (320 * RestMult + 133)

At 1.0 RestMult (normal unmodified character in a normal quality regular bed), this gives a value of 70.64% of the day awake, or ~16.95 hours. Higher RestMults will grant more hours per day awake per this equation, up to 18.189 hours (75.789% of the day) awake.

Beyond that point, we need a piecewise equation. The RestMult needed to be awake for 18.189 hours per day (0.75789 %DayAwake) is 1.301, which can be achieved with only a masterwork Royal Bed. After this point, we can use a fixed value for the ~75% of the day awake before hitting Tired, which results in a 72% drop in rest, and then compute the remainder of the time awake off of the rest fall rate when Tired (66.5% per day rather than 95% per day). This can be found by solving:

 0.72 + (%DayAwake - (0.72/0.95))*0.665 = (1 - %DayAwake) * (24/10.5) * RestMult

This gives:

 %DayAwake = (16000*RestMult - 1512) / (16000*RestMult + 4655)

At 1.3125 RestMult (an unmodified character in a masterwork Royal Bed), which is just past the threshold where this equation is needed, this gives a value of 75.962% 0f the day awake, or 18.231 hours.

At 1.68 Rest Effectiveness (the legendary quality Royal Bed in the table above) and a character with the Quick Sleeper trait (50% Rest Rate Multiplier), a Bionic Heart (+25% Blood Pumping = 7.5% Rest Rate Multiplier), and a Bionic or Royalty stomach (all of which are +25% part efficiency -> +12.5% Metabolism -> 3.75% Rest Rate Multiplier), for a net of 1.5*1.075*1.0375 = 1.673 Rest Rate Multiplier, the RestMult = 1.68 * 1.673 = 2.811. At that level, the character can be awake for 87.573% of the day, or 21.017 hours.

In theory, there also exists a point at which the Very Tired piece of the equation becomes a factor, but this would require a pawn to be awake for at least 96.84% of the day (23.242 hours). This would require a RestMult of at least 11.915 (ie. 1191.5%), which is impossible to hit in the base game (and even with most mod setups), and thus can be ignored.

If the character is using a Circadian assistant, their rest fall rate is reduced by 20%, meaning it takes 25% longer to reach each threshold. The equations in this case must be re-derived (derivation is left as an exercise for the reader), but the simple answer is:

A character otherwise unmodified except for the Circadian Assistant, using a normal quality bed, can be awake for ~75.047% of the day (~18.011 hours), about 6.3% more of the day than without the implant.
An otherwise-unmodified character in a masterwork Royal Bed can be awake for ~79.787% of a day (~19.149 hours), about 5% more of the day.
The above bionically-modified Quick Sleeper pawn in a legendary quality Royal Bed, with the addition of a Circadian Assistant, could be awake for ~89.421% of a day (~21.461 hours), about 2.1% more of the day.
None of these characters would ever reach "Tired", which takes ~94.737% of a day, or ~22.737 hours, with a Circadian Assistant installed.

Comparison tables

Underconstruction

Percentage = How muhc of each day is spent asleep to equal the rest required for the remaining day. Brakets = Hours spent asleep

Rest Rate Multiplier	Rest effectiveness
Sleep. spot	Bed	Bed + Sleep accelerator	Royal bed	Royal bed + Sleep accelerator
All (80%)	Awf. (86%)	Poor. (92%)	Norm. (100%)	Good (108%)	Exc. (114%)	Mast. (125%)	Leg. (160%)	Awf. (116%)	Poor. (124%)	Norm. (135%)	Good (146%)	Exc. (154%)	Mast. (169%)	Leg. (216%)	Awf. (90%)	Poor. (97%)	Norm. (105%)	Good (113%)	Exc. (120%)	Mast. (131%)	Leg. (168%)	Awf. (120%)	Poor. (129%)	Norm. (140%)	Good (151%)	Exc. (160%)	Mast. (175%)	Leg. (224%)
100% Nothing	34.14% (8.19 hrs)	32.54% (7.81 hrs)	31.07% (7.46 hrs)	29.32% (7.04 hrs)	27.75% (6.66 hrs)	26.68% (6.4 hrs)	24.91% (5.98 hrs)	20.59% (4.94 hrs)	26.32% (6.32 hrs)	25.03% (6.01 hrs)	23.5% (5.64 hrs)	22.15% (5.32 hrs)	21.23% (5.1 hrs)	19.73% (4.74 hrs)	16.11% (3.87 hrs)	31.47% (7.55 hrs)	30.04% (7.21 hrs)	28.32% (6.8 hrs)	26.78% (6.43 hrs)	25.73% (6.18 hrs)	24.01% (5.76 hrs)	19.8% (4.75 hrs)	25.62% (6.15 hrs)	24.36% (5.85 hrs)	22.85% (5.48 hrs)	21.53% (5.17 hrs)	20.63% (4.95 hrs)	19.16% (4.6 hrs)	15.62% (3.75 hrs)
104% BS	33.27% (7.98 hrs)	31.68% (7.6 hrs)	30.24% (7.26 hrs)	28.51% (6.84 hrs)	26.97% (6.47 hrs)	25.92% (6.22 hrs)	24.19% (5.81 hrs)	19.95% (4.79 hrs)	25.57% (6.14 hrs)	24.31% (5.83 hrs)	22.8% (5.47 hrs)	21.48% (5.16 hrs)	20.58% (4.94 hrs)	19.12% (4.59 hrs)	15.59% (3.74 hrs)	30.63% (7.35 hrs)	29.22% (7.01 hrs)	27.53% (6.61 hrs)	26.02% (6.24 hrs)	24.99% (6 hrs)	23.3% (5.59 hrs)	19.18% (4.6 hrs)	24.88% (5.97 hrs)	23.64% (5.67 hrs)	22.17% (5.32 hrs)	20.87% (5.01 hrs)	19.99% (4.8 hrs)	18.56% (4.45 hrs)	15.11% (3.63 hrs)
107% BH	32.64% (7.83 hrs)	31.07% (7.46 hrs)	29.64% (7.11 hrs)	27.93% (6.7 hrs)	26.41% (6.34 hrs)	25.37% (6.09 hrs)	23.67% (5.68 hrs)	19.5% (4.68 hrs)	25.03% (6.01 hrs)	23.79% (5.71 hrs)	22.31% (5.35 hrs)	21% (5.04 hrs)	20.12% (4.83 hrs)	18.68% (4.48 hrs)	15.21% (3.65 hrs)	30.03% (7.21 hrs)	28.64% (6.87 hrs)	26.96% (6.47 hrs)	25.47% (6.11 hrs)	24.46% (5.87 hrs)	22.8% (5.47 hrs)	18.75% (4.5 hrs)	24.35% (5.84 hrs)	23.13% (5.55 hrs)	21.68% (5.2 hrs)	20.4% (4.9 hrs)	19.54% (4.69 hrs)	18.13% (4.35 hrs)	14.75% (3.54 hrs)
111% BS+BH	31.84% (7.64 hrs)	30.29% (7.27 hrs)	28.88% (6.93 hrs)	27.2% (6.53 hrs)	25.7% (6.17 hrs)	24.69% (5.93 hrs)	23.01% (5.52 hrs)	18.93% (4.54 hrs)	24.35% (5.84 hrs)	23.13% (5.55 hrs)	21.68% (5.2 hrs)	20.4% (4.9 hrs)	19.54% (4.69 hrs)	18.13% (4.35 hrs)	14.75% (3.54 hrs)	29.27% (7.02 hrs)	27.89% (6.69 hrs)	26.25% (6.3 hrs)	24.78% (5.95 hrs)	23.79% (5.71 hrs)	22.16% (5.32 hrs)	18.19% (4.37 hrs)	23.68% (5.68 hrs)	22.49% (5.4 hrs)	21.07% (5.06 hrs)	19.82% (4.76 hrs)	18.97% (4.55 hrs)	17.59% (4.22 hrs)	14.3% (3.43 hrs)
118% BS+L	30.52% (7.32 hrs)	29.01% (6.96 hrs)	27.64% (6.63 hrs)	26.01% (6.24 hrs)	24.55% (5.89 hrs)	23.57% (5.66 hrs)	21.95% (5.27 hrs)	18.01% (4.32 hrs)	23.24% (5.58 hrs)	22.06% (5.29 hrs)	20.66% (4.96 hrs)	19.42% (4.66 hrs)	18.59% (4.46 hrs)	17.24% (4.14 hrs)	14% (3.36 hrs)	28.02% (6.72 hrs)	26.68% (6.4 hrs)	25.08% (6.02 hrs)	23.66% (5.68 hrs)	22.7% (5.45 hrs)	21.12% (5.07 hrs)	17.3% (4.15 hrs)	22.6% (5.42 hrs)	21.44% (5.15 hrs)	20.07% (4.82 hrs)	18.86% (4.53 hrs)	18.05% (4.33 hrs)	16.73% (4.02 hrs)	13.56% (3.25 hrs)
122% BH+L	29.82% (7.16 hrs)	28.33% (6.8 hrs)	26.98% (6.48 hrs)	25.37% (6.09 hrs)	23.94% (5.75 hrs)	22.97% (5.51 hrs)	21.38% (5.13 hrs)	17.52% (4.2 hrs)	22.65% (5.44 hrs)	21.49% (5.16 hrs)	20.12% (4.83 hrs)	18.91% (4.54 hrs)	18.09% (4.34 hrs)	16.77% (4.02 hrs)	13.6% (3.26 hrs)	27.35% (6.56 hrs)	26.03% (6.25 hrs)	24.46% (5.87 hrs)	23.06% (5.53 hrs)	22.12% (5.31 hrs)	20.57% (4.94 hrs)	16.83% (4.04 hrs)	22.02% (5.28 hrs)	20.88% (5.01 hrs)	19.54% (4.69 hrs)	18.36% (4.41 hrs)	17.56% (4.21 hrs)	16.27% (3.9 hrs)	13.18% (3.16 hrs)
126% BS+BH+L	29.15% (7 hrs)	27.68% (6.64 hrs)	26.35% (6.32 hrs)	24.76% (5.94 hrs)	23.36% (5.61 hrs)	22.4% (5.38 hrs)	20.84% (5 hrs)	17.06% (4.09 hrs)	22.09% (5.3 hrs)	20.95% (5.03 hrs)	19.6% (4.7 hrs)	18.42% (4.42 hrs)	17.62% (4.23 hrs)	16.32% (3.92 hrs)	13.22% (3.17 hrs)	26.71% (6.41 hrs)	25.41% (6.1 hrs)	23.87% (5.73 hrs)	22.5% (5.4 hrs)	21.57% (5.18 hrs)	20.05% (4.81 hrs)	16.38% (3.93 hrs)	21.47% (5.15 hrs)	20.35% (4.88 hrs)	19.04% (4.57 hrs)	17.88% (4.29 hrs)	17.1% (4.1 hrs)	15.83% (3.8 hrs)	12.81% (3.07 hrs)
156% BS+QS	24.94% (5.99 hrs)	23.61% (5.67 hrs)	22.42% (5.38 hrs)	21% (5.04 hrs)	19.75% (4.74 hrs)	18.91% (4.54 hrs)	17.54% (4.21 hrs)	14.25% (3.42 hrs)	18.63% (4.47 hrs)	17.63% (4.23 hrs)	16.45% (3.95 hrs)	15.42% (3.7 hrs)	14.73% (3.54 hrs)	13.61% (3.27 hrs)	10.96% (2.63 hrs)	22.75% (5.46 hrs)	21.58% (5.18 hrs)	20.2% (4.85 hrs)	18.99% (4.56 hrs)	18.17% (4.36 hrs)	16.84% (4.04 hrs)	13.66% (3.28 hrs)	18.09% (4.34 hrs)	17.11% (4.11 hrs)	15.96% (3.83 hrs)	14.95% (3.59 hrs)	14.28% (3.43 hrs)	13.19% (3.17 hrs)	10.61% (2.55 hrs)
161% BH+QS	24.36% (5.85 hrs)	23.05% (5.53 hrs)	21.88% (5.25 hrs)	20.48% (4.92 hrs)	19.26% (4.62 hrs)	18.43% (4.42 hrs)	17.09% (4.1 hrs)	13.87% (3.33 hrs)	18.16% (4.36 hrs)	17.18% (4.12 hrs)	16.02% (3.84 hrs)	15.02% (3.6 hrs)	14.34% (3.44 hrs)	13.24% (3.18 hrs)	10.66% (2.56 hrs)	22.2% (5.33 hrs)	21.05% (5.05 hrs)	19.7% (4.73 hrs)	18.51% (4.44 hrs)	17.71% (4.25 hrs)	16.41% (3.94 hrs)	13.3% (3.19 hrs)	17.62% (4.23 hrs)	16.67% (4 hrs)	15.54% (3.73 hrs)	14.56% (3.49 hrs)	13.9% (3.34 hrs)	12.83% (3.08 hrs)	10.31% (2.47 hrs)
166% BS+BH+QS	23.8% (5.71 hrs)	22.51% (5.4 hrs)	21.36% (5.13 hrs)	19.99% (4.8 hrs)	18.79% (4.51 hrs)	17.98% (4.32 hrs)	16.66% (4 hrs)	13.51% (3.24 hrs)	17.71% (4.25 hrs)	16.75% (4.02 hrs)	15.62% (3.75 hrs)	14.63% (3.51 hrs)	13.97% (3.35 hrs)	12.9% (3.1 hrs)	10.37% (2.49 hrs)	21.67% (5.2 hrs)	20.55% (4.93 hrs)	19.22% (4.61 hrs)	18.05% (4.33 hrs)	17.27% (4.14 hrs)	15.99% (3.84 hrs)	12.95% (3.11 hrs)	17.19% (4.13 hrs)	16.25% (3.9 hrs)	15.14% (3.63 hrs)	14.18% (3.4 hrs)	13.54% (3.25 hrs)	12.49% (3 hrs)	10.03% (2.41 hrs)
177% BS+L+QS	22.65% (5.44 hrs)	21.41% (5.14 hrs)	20.3% (4.87 hrs)	18.98% (4.56 hrs)	17.83% (4.28 hrs)	17.05% (4.09 hrs)	15.79% (3.79 hrs)	12.77% (3.06 hrs)	16.79% (4.03 hrs)	15.87% (3.81 hrs)	14.79% (3.55 hrs)	13.85% (3.32 hrs)	13.21% (3.17 hrs)	12.19% (2.93 hrs)	9.79% (2.35 hrs)	20.6% (4.94 hrs)	19.52% (4.68 hrs)	18.24% (4.38 hrs)	17.12% (4.11 hrs)	16.37% (3.93 hrs)	15.15% (3.64 hrs)	12.24% (2.94 hrs)	16.29% (3.91 hrs)	15.39% (3.69 hrs)	14.34% (3.44 hrs)	13.42% (3.22 hrs)	12.8% (3.07 hrs)	11.81% (2.83 hrs)	9.47% (2.27 hrs)
183% BH+L+QS	22.08% (5.3 hrs)	20.86% (5.01 hrs)	19.77% (4.74 hrs)	18.48% (4.44 hrs)	17.35% (4.16 hrs)	16.58% (3.98 hrs)	15.35% (3.68 hrs)	12.41% (2.98 hrs)	16.33% (3.92 hrs)	15.43% (3.7 hrs)	14.37% (3.45 hrs)	13.45% (3.23 hrs)	12.84% (3.08 hrs)	11.84% (2.84 hrs)	9.5% (2.28 hrs)	20.06% (4.81 hrs)	19% (4.56 hrs)	17.75% (4.26 hrs)	16.66% (4 hrs)	15.92% (3.82 hrs)	14.73% (3.54 hrs)	11.89% (2.85 hrs)	15.84% (3.8 hrs)	14.96% (3.59 hrs)	13.93% (3.34 hrs)	13.04% (3.13 hrs)	12.43% (2.98 hrs)	11.47% (2.75 hrs)	9.19% (2.21 hrs)
190% BS+BH+L+QS	21.44% (5.15 hrs)	20.24% (4.86 hrs)	19.18% (4.6 hrs)	17.92% (4.3 hrs)	16.81% (4.03 hrs)	16.07% (3.86 hrs)	14.87% (3.57 hrs)	12.01% (2.88 hrs)	15.83% (3.8 hrs)	14.95% (3.59 hrs)	13.92% (3.34 hrs)	13.02% (3.12 hrs)	12.42% (2.98 hrs)	11.45% (2.75 hrs)	9.18% (2.2 hrs)	19.47% (4.67 hrs)	18.43% (4.42 hrs)	17.21% (4.13 hrs)	16.14% (3.87 hrs)	15.42% (3.7 hrs)	14.26% (3.42 hrs)	11.5% (2.76 hrs)	15.35% (3.68 hrs)	14.49% (3.48 hrs)	13.49% (3.24 hrs)	12.62% (3.03 hrs)	12.03% (2.89 hrs)	11.09% (2.66 hrs)	8.88% (2.13 hrs)
215% BS+BH+L+QS+FM	19.43% (4.66 hrs)	18.32% (4.4 hrs)	17.33% (4.16 hrs)	16.17% (3.88 hrs)	15.15% (3.64 hrs)	14.47% (3.47 hrs)	13.37% (3.21 hrs)	10.76% (2.58 hrs)	14.25% (3.42 hrs)	13.44% (3.23 hrs)	12.5% (3 hrs)	11.68% (2.8 hrs)	11.14% (2.67 hrs)	10.26% (2.46 hrs)	8.2% (1.97 hrs)	17.6% (4.22 hrs)	16.65% (4 hrs)	15.52% (3.72 hrs)	14.54% (3.49 hrs)	13.88% (3.33 hrs)	12.81% (3.07 hrs)	10.3% (2.47 hrs)	13.81% (3.31 hrs)	13.03% (3.13 hrs)	12.11% (2.91 hrs)	11.31% (2.71 hrs)	10.78% (2.59 hrs)	9.93% (2.38 hrs)	7.93% (1.9 hrs)

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Rest Rate Multiplier	Rest effectiveness
80%	86%	90%	92%	97%	100%	105%	108%	113%	114%	116%	120%	124%	125%	129%	131%	135%	140%	146%	151%	154%	160%	168%	169%	175%	216%	224%
100% Nothing	34.14% (8.19 hrs)	32.54% (7.81 hrs)	31.55% (7.57 hrs)	31.07% (7.46 hrs)	29.95% (7.19 hrs)	29.32% (7.04 hrs)	28.32% (6.8 hrs)	27.75% (6.66 hrs)	26.85% (6.44 hrs)	26.68% (6.4 hrs)	26.34% (6.32 hrs)	25.69% (6.17 hrs)	25.06% (6.01 hrs)	24.91% (5.98 hrs)	24.33% (5.84 hrs)	24.05% (5.77 hrs)	23.5% (5.64 hrs)	22.85% (5.48 hrs)	22.12% (5.31 hrs)	21.55% (5.17 hrs)	21.22% (5.09 hrs)	20.59% (4.94 hrs)	19.8% (4.75 hrs)	19.71% (4.73 hrs)	19.16% (4.6 hrs)	16.11% (3.87 hrs)	15.62% (3.75 hrs)
104% BS
107% BH
111% BS+BH
118% BS+L
122% BH+L
126% BS+BH+L
156% BS+QS
161% BH+QS
166% BS+BH+QS
177% BS+L+QS
183% BH+L+QS
190% BS+BH+L+QS
215% BS+BH+L+QS+FM

Rest

Contents