Odd question and one I haven't been able to find an answer to. Do Eidolon's get fatigued/exhausted and for that matter do they need to sleep? Now I'm pretty sure they do get fatigued/exhausted as the unchained inevetiable subtype is immune to them. However there's enough issues with the unchained I'd like confimation. Especialy as there are items/abilities that allow characters to reduce/eliminate the need for sleep and I personally rather like them so I started picturing a summoner sitting there writing up their journal while an exhausted Eidolon slumbered beside them. Which led me to the Eidolon don't heal naturally unless you take fast healing. So three questions really. . .
1) Can an Eidolon get fatigued/exhausted in the same way characters can.
2) Do Eidolon's sleep naturally if kept out by a character who doesn't.
3) If they do get fatigued exhausted can they recover from those by sleeping or would it be blocked like normal healing in which case how would they recover from fatigue?
Nothing is free. Eidolon are summoned creatures of the Outsiders type. They are not native Outsiders. As such
Outsiders breathe, but do not need to eat or sleep (although they can do so if they wish). Native outsiders breathe, eat, and sleep.
And just like other outsiders, they can become fatigued/exhausted unless they have a special ability that says otherwise.
Also recovery from fatigue/exhausted only requires (complete) rest, not sleep. Sleep is a form of rest, but not the only form of rest. Well, at least that is my interpretation. Another interpretation is that unless a creature has an ability that says they can do X instead of sleep, they need to sleep to perform a complete rest.
After 8 hours of complete rest, fatigued characters are no longer fatigued.
After 1 hour of complete rest, an exhausted character becomes fatigued.