/ ˈsliːpləs; NAmE / adjective
1.
[ only before noun ] without sleep :
I've had a few sleepless nights recently.
2.
[ not before noun ] not able to sleep :
She lay sleepless until dawn.
► sleep·less·ly adverb
► sleep·less·ness noun [ U ]
SYN insomnia :
to suffer from sleeplessness