To Sleep or not to Sleep

Ok, so I have been having this debate with myself for a long time now. How much sleep do I need? Some days I will sleep 12 hours and feel tired all day, other days I will sleep 3 hours and be good for a long time. There are times when I am very productive when I haven’t had much sleep, and other times when I can’t get anything done because I am tired. So I am writing this post because I am not really tired, but I want to wake up early to ride my bike to work before 9. It is hard for me to wake up in the morning, which is possibly why I like to stay up late to get things done. I don’t know, I should try to get on a more regular schedule, but on the weekends I stay up late partying, and then sleep in late, and it makes it hard for me to go to bed early on sunday night, making it difficult to wake up early monday, and then the whole week is off. So I guess what I am trying to say is should I try to party less, go to bed earlier and get more work done, killing my social life? Or should I party the same amount, but then force myself awake on monday/every weekday to ensure I get my work done? And then in general should I sleep 8 hours a night, 4 hours a night, 10 hours a night? It always seems to vary for me how much I really need. I also feel that when I was really busy, I didn’t sleep as much, and I got a real lot done. I would love to get done with as much as I used to, but it is difficult because I don’t have as much pressure/desire I guess. So what do I need to have the pressure/desire to wake up early and to stay up late? I think I need to set some deadlines of things I need to get done with my life. Soon.