Editing Circadian assistant

{{Royalty}}
{{Infobox main
| name = Circadian assistant
| image = Health item bionic.png
| type = Medical Items
| type2 = Body Parts
| tech level = Spacer
| description = An artificial gland. Produces chemicals and nanomachines that clear toxin buildup from the brain.
| 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
| marketvalue  = 1030
| thingSetMakerTags = RewardStandardLowFreq
| tradeTags = Bionic, ImplantEmpireCommon
| techHediffsTags = Advanced, ImplantEmpireCommon
}}
The '''circadian assistant''' is an [[artificial body part]] that slows the rate at which pawns get [[Rest|tired]].

==Acquisition==
A circadian assistant is made with {{icon|plasteel|15}} [[Plasteel]], {{icon|advcomponent|4}} [[advanced component]]s and {{Ticks|{{P|Work To Make #}}}} of work at the [[fabrication bench]], after the [[Research#Circadian influence|Circadian Influence]] research is completed. The required [[techprint]] can be obtained either by [[trade]] or completing [[quests]] for the [[Empire]]. They require a [[Skills#Crafting |crafting skill]] of 8

Pawns from [[ancient danger]]s may have this implant installed.

== Summary ==
An installed circadian assistant decreases [[Sleep Fall Rate]] by {{Good|-20%}}. This does ''not'' equal 20% less sleep. See [[#Sleep saved|Sleep Saved]] for the exact details. This modifier is applied ''before'' [[gene]]s and [[drug]]s, so in most situations it is equivalent to a simple {{Good|×80%}} factor.

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

=== Installation ===
Installing the part requires {{Ticks|2500}} of work, 2x medicine of [[Herbal medicine|herbal]] quality or better, and a [[Skills#Medical|Medical skill]] of 5.

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

If the operation fails, the part will be destroyed.

== Analysis ==
The circadian assistant increases work hours without impacting Consciousness like the [[Circadian half-cycler|half-cycler]]. However, this implant is virtually always worse for productivity than either a [[bionic arm]] or [[bionic leg]], depending on the type of work the colonist focuses on. The brain shock makes using [[EMP]] against [[mech]]s more difficult, but gives a way to safely down the pawn in case of a [[mental break]] or [[prison break]]. 

With high quality [[bed]]s, and/or other positive modifiers to rest, consider setting a pawn's [[schedule]] entirely to Anything. A pawn with greatly enhanced sleep will go beyond a 24 hour sleep schedule, which means that pawns will spend less time moving to/from their bed. Remember that being in [[light|darkness]] will reduce work speed by a significant percentage, unless there is [[Ideoligion#Lighting|something]] [[Genes#Dark vision|mitigating]] [[light|this]].

=== Sleep saved ===
In essence, the circadian assistant only has an effect ''while the pawn is awake''. Therefore, '''actual sleep saving will always be lower''' than expected values. 

For example, a baseline pawn in a normal [[bed]] would spend 18.19 hours awake per 7.56 hours sleeping, to avoid being Drowsy. The assistant increases awake time to (18.19/0.8), or 22.74 hours awake, without impacting the sleep needed.

* A baseline pawn in a normal bed spends (18.19 hr awake) / (7.56 + 18.19 hr total) = 70.6% of a day awake. Equal to 16.95 hr awake per 24 hour cycle, or 7.05 hours sleeping.
* With the circadian assistant, this becomes (22.74 hr awake) / (7.56 + 22.74 hr total) = 75.04% of a day awake. Equal to 18.01 hr awake per 24 hour cycle, or 5.99 hours sleeping.

This means that, in a normal bed, the circadian assistant actually reduces sleep time by roughly {{---|15%}}, or about 1.06 hours per day, rather than the expected -20%.

Alternatively, you could say that the circadian assistant increases awake time by {{Good|x106.3%}}. Increasing [[Rest Effectiveness]] or [[Rest Rate Multiplier]] will actually lower the time savings of this implant. For example, a [[quick sleeper]] installing a circadian assistant would end up increasing awake time by {{Good|x104.5%}}, saving about 0.853 hours per 24-hour day compared to quick sleeper on its own.

=== Comparison to other bionics ===
With a rough baseline of actual sleep saved calculated above, it is possible to compare the ciradian assistant to other bionics.

[[Bionic arm]]s and [[bionic leg]]s increase [[Manipulation]] or [[Moving]] by +12.5%, per part, which increase work speed / travel speed by that amount. While "awake time" would increase both time working and travel time, the other parts are more specialized and thus are generally better at increasing a specific work's speed. In addition, both bionic arms and legs have ''some'' functional benefit in combat. Rest does ''not'' impact combat until 0% rest, where exhausted pawns will collapse on the ground. 

If 2 bionic arms and/or 2 legs have already been installed, then the assistant offers a decent functional benefit. [[Bionic heart]]s offer {{Good|x105%}} Moving and an approximate 0.3 hour per day sleep reduction, so the circadian assistant would be better for work. However, it still confers an EMP weakness.

== Notes ==
Despite its description, it does nothing to mitigate toxic buildup.

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