hypersomnolence

noun

hy·​per·​som·​no·​lence ˌhī-pər-ˈsäm-nə-lən(t)s 

: excessive daytime sleepiness despite sufficient nighttime sleep

hypersomnolence brought on by sleep apnea or depression

Treatment with CPAP improves quality of life, vigilance, and cognitive function in persons who report hypersomnolence …

—Kingman P. Strohl

also : prolonged nighttime sleep : hypersomnia

Word History

First Known Use

1918, in the meaning defined above

Medical Definition

hypersomnolence

noun

hy·​per·​som·​no·​lence -ˈsäm-nə-lən(t)s 

: excessive daytime sleepiness despite sufficient nighttime sleep

hypersomnolence brought on by sleep apnea or depression

also : prolonged nighttime sleep : hypersomnia sense 1