Hi Harmony,
Welcome to KittyCatS.
The cats will fall asleep when their energy drops to 0%.
When they fall asleep, they also 'jump' to their home point.
Their home point is set automatically where the cat is rezzed or the box unpacked for newborns,
but you can also set it where you want by yourself, for example on one of the beds
you got for the kitties or on the cat tree.
To do so, just left click the cat to open its menu, go in "Animation" and "Set Home" after you
have edited the cat & put it where you want it to sleep.
Kittens (until 7 days old) sleep 4 hours and are awake 4 hours.
Adults sleep 8 hours and are awake 8 hours.
Have fun with them !
Nen