Couldn't sleep

I finished working the night shift on Friday morning. Then I went and stopped in at my company's head office in Tachikawa. I stayed there until noon. After that I went home, ate lunch, and got on the computer. If I remember correctly, it was around 15:30 that I gave in and decided to sleep. I got up around 18:30 (3 hrs). I ate supper and then got back on the computer. At 23:00 I was sleepy again, which was a good thing. I wanted to sleep the whole night. I went to bed then but found myself awake at 2:30 Saturday morning. Finally, after 3:00, I decided to just get up because it was obvious I wasn't going to fall back to sleep. I stayed up until at least 4:30. Then I went back to bed and couldn't get up until 12:30. So then I was up ALL night Saturday night. (That was just last night.) I couldn't sleep at all. I started getting sleepy and so at 6:00 I tried to take a nap but I could not fall asleep right away. I needed to get up at 6:30. It was just at that time when I could have fallen asleep, but instead I had to get up. Now it is past 11:30 and I am really tired. But I think I should stay up until evening and then go to bed.