Sleep Hours longer than 4 hours can recover animal from wounds.
These Sleep hours (Usually midnight sleep) can be used by the GM to update some events:
Note that sleeping in an unsafe place might trigger an ambush by predators.
Rabbits prefer a Crepuscular activity pattern (nor Diurnal or Nocturnal)
They may sleep on average 8 hours a day
but divided into the both middles of day and night
Most Other (playable) animal prefer a Nocturnal or Crepuscular cycle
These are not strict rule to respect and any animal may sleep at any time.