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2017 Word of the Year

hypersomnia

[hahy-per-som-nee-uh] /ˌhaɪ pərˈsɒm ni ə/
noun, Pathology.
1.
a tendency to sleep excessively.
Origin of hypersomnia
1875-1880
First recorded in 1875-80; hyper- + (in)somnia
Related forms
hypersomniac, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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hypersomniac in Medicine

hypersomnia hy·per·som·ni·a (hī'pər-sŏm'nē-ə)
n.
A condition in which one sleeps for an excessively long time but is normal in the waking intervals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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