Sleep can be a fleeting thing. Some common problems to interrupt with sleep are aches and pains, insomnia and poor stress management.
To get you counting zzz's again, you might try:
- Relax Your Neck, Liberate Your Shoulders: The Ultimate Exercise Program for Tension Relief by Eric Franklin
- Sleep Deep: Simple Techniques for Beating Insomnia by Karen Williamson
- The Insomnia Solution: The Natural, Drug-free Way to a Good Night's Sleep by Michael Krugman
And, if it's weird dreams interrupting your sleep, maybe you might try searching for a dream interpretation book in the 154.6 section of the Information Library.