"Go the F--k to Sleep", by Adam Mansbach. It's a great book that's helped me much in my personal life. I used to have trouble falling asleep at night, often finding myself worrying about issues that had come up during the day, and being unable to put work away when I needed to sleep. Since reading it, I've found that I can put away these fears and problems far better than I could before. I highly recommend it to anyone who has trouble sleeping from time to time.