So there you are, getting ready to go to bed. It has been a long day. You probably came from work, where you spent the whole day concocting complicated reports in front of the computer. Or perhaps you’re a student who just came from school after a stressful day of reading books and listening to presentations. You enter your bedroom, celebrating in the fact that it’s finally time for some soothing, restful sleep. When you finally lie down, you find yourself repetitively turning from one side of the bed to the other. After a frustrating hour of tossing and turning, you realize the fact that you can’t fall asleep. How can you not fall asleep after the tiring day you just had?