[alexozer]

Interesting, it's the opposite for me. If I'm feeling rotten, unmotivated, unproductive, and guilty about it, I'll tend to stay up later because my "self-discipline for the day" will feel eroded and I'll want to procrastinate the arrival of the next day where I'll be faced with dealing with the thing I put off. I can only usually make myself go to bed early if I feel like I'm already in a "disciplined state" for the day.