sleeping pattern

Yawn! =_=, I'm staying up late tonight (again), but I'll get to sleep in. I usually sleep late, but I always feel weird in the morning and fall asleep during class... I know it's bad!!! But I can't help it!!! I feel like I waste my time if I sleep... but it also feels good when I sleep... so I can't choose!!! Arghhh Im confused now... should I sleep or stay awake?