The basic idea of the ERC project is that we are able to influence our sleep with our thoughts due to the unconscious reactivation of these thoughts during sleep. For example, if we think of an important exam coming up the next day before going to bed, this thought is then re-activated repeatedly during sleep. As it is associated with stress, reactivating “exam” disturbs our ongoing sleep. Importantly, if we would manage to activate the thought "rest" or "sleep well" before sleep, this should actually improve our sleep quality. In the project, three main questions are traced: Can we experimentally prove that reactivation of thoughts and concepts influence our sleep? Can this reactivation be used in a positive way - for example generating positive thoughts or intentions while being awake to then sleep better? Can we apply these findings to improve disturbed sleep? As high sleep quality is important for our health and well-being, the results of the project are highly relevant for our society.