Usually Doesn't Sleep

Usually Doesn't Sleep is the modified advantage concept of enhancing the presumably always-on Doesn't Sleep trait (B50) with the +5% enhancement Usually On.
1/20 of a 20 point advantage is essentially a perk.
This allows creatures which normally do not (and CANNOT) sleep to actually voluntarily fall asleep by spending FP.
This is only if you assume "doesn't sleep" to mean "can't sleep". That's not entirely clear since it actually might be optional (switchable by default) based on the description:
*"do not have to sleep"
*"can ignore all ill effectS"
"Don't have to" isn't "cannot" and "can ignore" is not "must ignore". So it might be possible to still sleep or voluntarily take on ill effects.
It might even be possible to do that (kind of like Selective Effect) separately: choosing to sleep while still ignoring effects, or voluntarily suffering effects of missing sleep without needing to sleep.
This would be important to know for abilities with accessibilities like "only while sleeping" or "only on sleeping subjects".
It is also important to know if you can voluntarily take FP damage to Fatigue Attack (Hazard: Missed Sleep) or Leech (FP: Missed Sleep) the latter which could be used to help an ally.
Presumably if you lost FP to sleep, you can temporarily avoid the effects (penalties, obligation to sleep) with a temporary activation of doesn't sleep (for example if it had max duration or costs HP limits) but you would still be missing the FP and the standard requirement of needing to sleep to restore it would apply.
Sleep is also a way to have a programmed "time to fall unconscious" which is useful as a biological override if you expect to be mind controlled, or unable to exit an autotrance voluntarily (presumably unconsciousness due to sleep ends a trance, and mind controlled subjects still need to sleep.
That's also a good limit to possession: doesn't sleep is a physical trait so even if a spirit didn't need to, it couldn't normally bring that to it's host unless it was enhanced with Cosmic or somehow shifted from a physical to a mental trait (for example, if limited with requires Will roll) which would allow it to transfer.
*P235 "mental ability" says "Any ability based on a mental advantage or that requires an IQ, Will, or Per roll"
*P157 "he enjoys all the benefits of his puppet’s physical abilities and his own mental ones"
This would conversely mean if Doesn't Sleep shifted from physical>mental that if you were possessed, the possessing force could not enjoy it.
It also means using Duplicate Advantages you could have both mental and physical forms, so that you could lend it to possessors OR take it with you when possessing.
*this would be important even if your abandoned body was not possessed: if you took "doesn't sleep" with you to your new body, your old body needs it. Unconsciouness probably counts like sleep though so that's more important for stuff like 'Doesn't Eat' or 'Doesn't Breath' if they became mental instead oh physical: your left-behind body lacks it when your mind goes away.
Category:Perks