chronic inability to fall asleep or to enjoy uninterrupted sleep related adjective agrypnotic
Derived Forms
insomnious, adjective
Word Origin
C18: from Latin, from insomnis sleepless, from somnus sleep
Word Origin and History for insomnia
n.
1620s, insomnie, from Latin insomnia "want of sleep," from insomnis "sleepless," from in- "not" (see in- (1)) + somnus "sleep" (see Somnus). The modern form is from 1758.
insomnia in Medicine
insomnia in·som·ni·a (ĭn-sŏm'nē-ə) n. Chronic inability to fall asleep or remain asleep for an adequate length of time.
insomnia in Science
insomnia
(ĭn-sŏm'nē-ə) Chronic inability to fall asleep or remain asleep for an adequate length of time.