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Definition of sleepless adjective from the Oxford Advanced American Dictionary

sleepless

adjective
/ˈslipləs/ sleepless pronunciation American
 
1 [only before noun] without sleepI've had a few sleepless nights recently.2 [not before noun] not able to sleepShe lay sleepless until dawn. sleeplessly
sleeplessly pronunciation American
adverb
sleeplessness
sleeplessness pronunciation American
noun [uncountable] synonym insomniato suffer from sleeplessness