What does "hypernychthemeral" mean?

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).

Hypernychthemeral

adj

adj ·Rare ·Advanced level

Definitions

Adjective

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). not-comparable

Etymology

From hyper- + nychthemeral.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.