circadian rhythm

Was wondering how many nights people do on average... I guess I would define night as a shift that crosses midnight; so obviously 10/11p to 7a, but also 5p-2a since that's enough to through off the circadian rhythms (for me, at least). Based on some responses in a recent thread, I'm wondering...

Hello :) I'm gonna type my question first, then give a little details about it.... My question is: Is adenosine regulated by circadian rhythm? Here's why I asked this question: After long morning at college during summer semester, I feel really tired, and I really need to get some sleep!! I...