Yup. When I'm depressed I tend to sleep a lot less than when I'm stable. It's not really by choice though. It's that the [negative] thoughts racing through my mind won't let me sleep, or I only half-sleep (tossing and turning; half-awake, half-asleep) and it always makes me that much more irritable and angry.

Then again, I'm stable now and I've been staying up really late lately, simply because it's my quiet time.