Main Entry:

sleep·less

Pronunciation:

\ˈslēp-ləs\

Function:

adjective

Date:

15th century

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