I 'm so sleepy

I am so sleepy. I always go to bed about at 3 or 4 a.m. recentry. I am so tired. I have to work and study. I want to bed as soon as I can. Today I have a part time job. I have to work till 12 p.m. After that, I have a party, because today is my birthday. I am happy because my friends will hold a party for me. I think I will not be able to go to bed soon today, but I want to enjoy the party. I have three classes today. After school, I should go back home soon and go to bed.