F51.2
Nonorganic disorder of the sleep-wake schedule
Coding guidance (WHO 2019)
A lack of synchrony between the sleep-wake schedule and the desired sleep-wake schedule for the individual's environment, resulting in a complaint of either insomnia or hypersomnia. Psychogenic inversion of: circadian nyctohemeral sleep rhythm Excl.: disorders of the sleep-wake schedule (organic) (G47.2)