Melotonin Pills

I have been troubled by some kind of sleep disorder for two months. Having a sound sleep doesn't seem to as easy as before. I am a person who needs at least 8 hours' sleep a day and who goes to bed before 9 P.M. However, I haven't been able to fall asleep before 10 o'clock this semester. What makes the situation even worse is that I'm getting up around 2:00 A.M. almost EVERY DAY. I can't function well when my sleep is 4 hours shorter than I need.  
After I shared this concern with my prayer group, they prayed for me, and one of the sisters even gave me some melatonin pills. According to her, these pills are very helpful.
Last night I took one pill. For the first time in my life, I went to bed with the help of medicine. Having tossed around and yawned in bed for about 10 minutes, I finally fell asleep. Then when I woke up, it was 5:10!!! I can't believe I could get up this late! However, I had a weird feeling after getting up--I felt as if I were still at night. I assume melatonin worked in my system because it seemed to readjust my body clock. I'll find out how this tiny white pill will affect me in the afternoon.