Catalog

Hypernychthemeral syndrome

No MMS code

Link to WHO Definition

Hypernychthemeral syndrome – http://id.who.int/icd/entity/1854260949

Non 24-hour sleep wake disorder is a rare circadian rhythm disorder characterised by a chronic, steady pattern of daily delays (of 1-2 hours) in sleep onset and wake time in an individual. In this condition, the sleep and wake times get continually later.