I used to do all my study and music-work in the wee hours of the morning, but lately I've found if I over work myself during the day, to the point that I can't really think much anymore, I can just chill in the late hours without feeling depressed and such..
I thought I was the only person on the planet that would love running around at 2 in the morning, it can be a beautiful thing huh
Sometimes though I find creative outlets are the best release at this time, meaning if you've done nothing during the day, you'll feel miserable at night because the thoughts build up, so if you've had a slack day, create something or write something until you can't possibly do any more any more. If you've had a very productive day, maybe watching some cartoons, hanging out with someone, or if you're lucky having some sex will satisfy.
Another solution of mine was to read, read until I couldn't possibly stay awake any more and I pass out.
Oh and post strange opinions on here, I love doing that in the late hours
Sometimes though (I don't know how common this is) if I don't create something I CAN NOT relax and it feels like my brain will not let me rest, so I simply get on with whatever project I'm working on till I can't possibly handle it..
So yeh in conclusion my solution came through over-doing it in various ways.. Don't know how healthy that is for all of us though.
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All hail the new flesh, cause it suits me fine!