Editing Circadian half-cycler

{{Royalty}}{{infobox main|
| name = Circadian half-cycler
| image = Health item bionic.png|Circadian half-cycler
| type = Medical Items
| type2 = Body Parts
| tech level = Spacer
| description = A signal redirector which isolates half of the brain, allowing the other half to sleep while the user remains outwardly awake. By alternating brain halves, the user never needs to sleep. Unfortunately, two hemispheres are better than one - working half a brain causes a reduction in consciousness.
| production facility 1 = Fabrication bench
| research = Circadian influence
| skill 1 = Crafting
| skill 1 level = 8
| resource 1 = Plasteel
| resource 1 amount = 15
| resource 2 = Advanced component
| resource 2 amount = 4
| work to make = 26000
| mass base = 4
| hp = 50
| flammability = 1.0
| thingSetMakerTags = RewardStandardLowFreq
| tradeTags = Bionic, ImplantEmpireCommon
| techHediffsTags = Advanced, ImplantEmpireCommon
}}
The '''circadian half-cycler''' is an [[artificial body part]] that removes a pawns need to sleep at the cost of a permanent 15% [[Consciousness]] penalty.

== Acquisition ==
Circadian half-cyclers can be crafted at a [[{{P|Production Facility 1}}]] once the [[Research#{{P|Required Research}}|{{P|Required Research}}]] research project has been completed. The required [[techprint]] can be obtained either by [[trade]] or completing [[quests]] for the [[Empire]]. They require {{Required Resources}}, {{Ticks|{{P|Work To Make}}}} of work, and a [[{{P|Skill 1}}]] skill of {{P|Skill 1 Level}}.

== Summary ==
A circadian half-cycler is installed in the brain and removes the [[Sleep]] need entirely. [[Consciousness]] is reduced by 15%, which itself reduces work-related stats like [[Moving]] and [[Manipulation]], as well as [[Eating]] and [[Talking]].

When a pawn with this implant is shocked with [[EMP]], they will receive [[brain shock]], knocking them unconscious temporarily.

=== Installation ===
{{stub|section=1}}
Installing the part requires {{ticks|2500}} of work, 2x medicine of ?? quality or better, and a [[Skills#Medical|Medical skill]] of 5.

Removing the part requires {{ticks|2500}} of work, 1x medicine of ?? quality or better, and a [[Skills#Medical|Medical skill]] of 5.

If the operation fails, the part has a chance{{Check Tag|What Chance?}} to be destroyed.

== Analysis ==
Assuming a colonist sleeps for 8 hours, this implant allows them to work an additional ⅓ of the day, and saves space on a bedroom. Even with the consciousness loss, this makes pawns have more work time, and thus better for many tasks. This assumes you don't have many sleep reducers; see [[#Comparison to reducing sleep]] for details on that.

An unfortunate side effect of the half-cycler is [[mood]]. No sleep will prevent Lovin' entirely, remove the moodlet from an impressive bedroom, and deprive a pawn of a bed's [[Comfort]] level. An [[armchair]] can provide comfort for crafter-type pawns, but all these mood-increasers are quite significant. Non-ascetic [[noble]]s still desire a bedroom that meets their needs.

===Work===
The consciousness loss has a different effect on different work types.
<br>'''Good:'''
*'''Research, Hauling, Cleaning:''' All done slower, but they have no quality. The extra time easily makes up.
*'''Cooking:''' Like above; [[food poisoning]] chance is not increased.
*'''Construction, Crafting, Art:''' will produce the same-[[quality]] items, so the extra time is a net positive. Note that low-skill construction is more likely to fail.

*Menial, quality-less tasks like Cooking, Research, Hauling, or Cleaning are done slower, but the extra time easily makes up for it.
**Does not increase [[food poisoning]] chance.
'''Mixed:'''
*'''Plants:''' Allows more plants to be harvested, but lowers yield per plant. Bad when plant space is limited, good if not.
*'''Mining:''' Good for mining regular rock or [[deep drill]]ing, bad for mining ores.

'''Bad:'''
*'''Social, Animals:''' The half-cycler is of little help: trade is limited, prisoners and animals sleep. Lowered Consciousness means more failed attempts and higher prices.
*'''Medical:''' Tends slower, with less quality, and have less successful surgeries. Tend speed is incredibly important, but tending itself is not.
*'''Combat:''' Worse accuracy, will get injured more, and more likely to die from Conciousness loss.
**[[EMP]] also becomes harder to use due to Brain Shock. It may be wiser to EMP [[mechanoid]]s even if it'd hit a half-cycler pawn, which means you just lose a combatant.

Of course, pawns can be good at multiple work tasks. For example, a pawn that mostly does Crafting can also be your main Social pawn; independent cases should be weighed differently.

==Comparisons==
=== Comparison to reducing sleep ===
{{Rewrite|section=1|reason=Update comparisons from table on [[Rest]]}}
A high quality [[royal bed]], improvements to [[metabolism]] and [[blood pumping]] such as [[bionic stomach]]s and [[bionic heart]]s, and of course the [[circadian assistant]] all affect a pawn's need for rest. 

A bionic stomach and heart increase the [[Rest Rate Multiplier]] to 111%, a legendary [[quality]] royal bed provides 168% [[rest effectiveness]], and the circadian assistant decreases [[rest fall rate]] by 20%. Thus, they can reduce the required sleep down to 43%. [[Luciferium]] further improves the rest rate multiplier to 126%, and the required sleep down to 38%. Thus, the circadian half-cycler gives the pawn approximately an 4-4.5 hours of working time compared to an optimum sleeping set up, at the expense of the consciousness penalty, the loss of impressive bedroom, comfort the loss and lovin' mood buffs. The effect of the consciousness loss means that a pawn with a half-cycler will work slower, losing work progress approximately equivalent to 2 hours compared to a regular pawn over the course of the day.

===Comparison to Never Sleep===
{{Biotech|section=1}} 
The '''never sleep''' [[gene]] will completely prevent sleep with no Consciousness loss. However, with a metabolic efficiency of -6, it requires negative genes or ''archite metabolism'' to even be used at all. It takes a large amount of negatives to negate the penalty, or [[archite capsule]]s for the aformentioned metabolism gene.

Never sleep is not found in any of the default [[xenohumans]], so a [[genepack]] must be found, both for the sleep gene and whatever you're using to compensate. Alternatively, you can start with the gene, which still comes at the genetic cost.

{{nav|body parts|wide}}
[[Category:Medical Item]] [[Category:Body Part]] [[Category:Implant]]