- without sleep: a sleepless night.
- watchful; alert: sleepless devotion to duty.
- always active: the sleepless ocean.
Origin of sleepless
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sleepless
It was a sleepless night in Chechnya for two lawyers from the Russian town of Orenburg, Sergei Babinets and Dmitriy Dimitriyev.Putin’s Favorite Acolyte Terrorizes Human Rights Activists
December 14, 2014
I blame a sleepless night or free drinks at a cocktail party.Mommy’s Little Secret? Coffee And Booze.
May 11, 2014
And behind the sleepless Moms will come binders full of freshly scrubbed lawyers looking to turn a buck on the news.Could Tylenol Cause ADHD?
February 25, 2014
Now we are learning that it is not just sleepless nights looking after Prince George that may have unsettled his mood.Hacking Trial Delivers an Unwelcome Christmas Present For William and Kate
December 19, 2013
Building a business around teen trends is a guarantee of sleepless night.Snapchat’s Diss Captures Facebook’s Cruel Cool World
November 16, 2013
In your service I have spent many toilsome days and sleepless nights.Philothea
Lydia Maria Child
Long was the conference, and sleepless the couch, of Mr. and Mrs. Morton.Night and Morning, Complete
In any great trouble, any terrible suspense, look at our sleepless nights!The Channings
Mrs. Henry Wood
If the Marquis can spend a sleepless night, we can afford to do so.The Inn at the Red Oak
That night I was sleepless—but about Charley—not about Mary.Wilfrid Cumbermede
- without sleep or resta sleepless journey
- unable to sleep
- always watchful or alert
- mainly poetic always active or movingthe sleepless tides
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for sleepless
Online Etymology Dictionary, © 2010 Douglas Harper