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Definition of sleepless adjective from the Oxford Advanced Learner's Dictionary

sleepless

adjective
sleepless pronunciation English ˈsliːpləs sleepless pronunciation American ˈsliːpləs
 
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 English ˈsliːpləsli sleeplessly pronunciation American ˈsliːpləsli
adverb sleeplessness
sleeplessness pronunciation English ˈsliːpləsnəs sleeplessness pronunciation American ˈsliːpləsnəs
noun [uncountable]
Synonym
insomniato suffer from sleeplessness