With the latest beta (188.8.131.52), villagers can now sleep during the night. Animals-like mobs should sleep too (therefore undeads are excluded).
This feature should not affect every animal in the same way. For example, ocelots (that are nocturnal) should be active during the night, as well as bats.
For all the animals that will sleep during the night, no strict rules will be applied: they will have a small chance to stay awake. Also, a noise nearby could make them wake up and, in some cases, to disperse (in general, I think they should prefer to sleep in groups, hence the term "disperse").
This feature would make their behavior more credible and make the game world more lively.
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