Prince is finding it hard to fall asleep these nights, after having been outside. He seems over-excited, and though he tries hard, and kneads and purrs, it takes him a long time to relax enough to be able to sleep. When I bring him up, he eats dinner, drinks, uses the litter box and goes to bed. His bedtime used to be 8 pm but now he won't come up home till about 10 pm. When he didn't go out at all, he'd be lethargic and sleep all day.