Is sleep the missing piece of the mental health puzzle? For many people, a change in sleep patterns is the first sign and warning sign of a change in mental health. In order to scientifically understand this relationship and adopt practical methods to improve sleep, the structure of brain function and the cognitive-behavioral mechanisms related to it must be studied. The first step in the scientific analysis of sleep health is the exact separation of the two concepts of lack of sleep and insomnia; Two categories mistakenly used interchangeably even in the media and in some scientific papers.