For me it doesn't matter simply because I also have a sleep disorder. It always takes me 2 to 4 hours to fall asleep and then I wake up every hour. After the 3rd interruption I can't go back to sleep. I average 4 hours. On weekends I can some times squeeze in a 8 hour day. And it's been like this for the past 12 years.

When I'm depressed I just don't feel like getting up, when I'm baseline, I still don't feel like getting up, when I do get hypomanic, as soon as I think of some thing I want to do I get right up. That's the only way I know