About 5% of all Germans suffer from a pronounced, severe, or chronic form of non-restorative sleep, characterized by difficulties with falling and staying asleep. The new edition of the guide is aimed at all individuals who experience temporary or chronic insomnia and can use the guide to effectively address their sleep disorder. The guide presents effective behaviorally-oriented measures to reduce difficulties with falling and staying asleep. These include relaxation techniques, education about sleep and sleep hygiene, rules for structuring the sleep-wake cycle, and cognitive techniques to avoid nighttime rumination. In addition to specific techniques for treating insomnia, this guide also provides an overview of the physiology and psychology of sleep.