Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sleep hygiene is the controlling of "all behavioral and environmental factors that precede sleep and may interfere with sleep." It is the practice of following guidelines in an attempt to ensure more restful, effective sleep which can promote daytime alertness and help treat or avoid certain kinds of sleep disorders. Trouble sleeping and daytime sleepiness can be indications of poor sleep hygiene or sleep habits. Learn more about sleep hygiene, its importance and guidelines in the following pages.