Dictionary

sleepless

adjective sleep·less \ˈslēp-ləs\

: without sleep

: not able to sleep

Full Definition of SLEEPLESS

1
:  not able to sleep <lay sleepless with fever>
2
:  affording no sleep <sleepless nights>
3
:  unceasingly active or operative <sleepless casinos>
sleep·less·ly adverb
sleep·less·ness noun

Examples of SLEEPLESS

  1. He lay sleepless in bed.

First Known Use of SLEEPLESS

15th century

sleepless

adjective sleep·less \ˈslē-pləs\   (Medical Dictionary)

Medical Definition of SLEEPLESS

:  not able to sleep :  insomniac
sleep·less·ness noun

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