I am going crazy

I hate working the 5 a.m. shift two days in a row. I get so tired that I don't want to do anything. I just want to sleep, but I end up hearing or dreaming weird things. For instance, today, I got to work and then signed in. I went to my desk and kicked back and tried to go to sleep. As I was about to fall asleep I hear someone walk by my desk, and it wakes me up. This happened 5 times. Every time it happened, I woke up really fast and got up to see who it was, and no one was there. Cool. Kind of scared the crap out of me.