Definition of sleepless adjective from the Oxford Advanced American Dictionary

sleepless

adjective
/ˈslipləs/
 
 
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
 
adverb
sleeplessness
 
noun [uncountable] synonym insomniato suffer from sleeplessness
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