hypernychthemeral

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English[edit]

Etymology[edit]

hyper- +‎ nychthemeral.

Adjective[edit]

hypernychthemeral (not comparable)

  1. Of or relating to a neurological sleep disorder characterized by one- to two-hour daily delays in sleep onset and wake times, i.e. a circadian rhythm greater than a nychthemeron (24 hours).