It's four o'clock in the morning. The brief flash of thought about the conflict with the work colleague while falling asleep suddenly turned into an endless loop of musings and the night consisted only of tossing and turning. The worst: One is already aware that the carousel of thoughts around the problem is not exactly productive and will not lead to a solution. Completely exhausted, one finally finds one's way to sleep. Exactly this scenario befalls countless people every night, puts a strain on coping with everyday life and, in the most extreme case, even promotes mental illness. But what can help?