If you want to fall asleep, find some books that you don't understand. It's good to read math if you don't know math, English if you don't know English, and Buddhist scriptures. If you can't sleep, you must get up and read linguistics. Make sure you fall asleep immediately.
If you don't want to fall asleep, it's good to read Jin Yong's novels.
If you don't want to read, you can do qigong, meditate, write calligraphy and watch DVD.