Insomnia

For the past month I've bee having a hard time going to sleep early. The earliest I've slept is 2AM. I usually fall asleep at 4AM. It really sucks, since I always wake up close to noon. Yesterday I slept at 7AM (aaarrrgghhhh!) and woke up at 11AM. My mom already gave me a sleeping pill. She told me to drink half of it and see if it will work on me. But I'm a wuss so I haven't tried it. How can I cure this?