sleep·less 
/ˈsli:pləs/ adjective
/ˈsli:pləs/ adjective 1 always used before a noun : without sleep
▪ a sleepless night 2 not used before a noun : not able to sleep
▪ He lay sleepless in bed.
▪ a sleepless night
▪ He lay sleepless in bed.
— sleep·less·ly adverb
▪ He lay sleeplessly.
▪ He lay sleeplessly.
— sleep·less·ness noun [noncount]
▪ He suffers from sleepnessness. [=insomnia]
▪ He suffers from sleepnessness. [=insomnia]
