sleep away(redirected from slept it away)
To sleep throughout or during a large portion of a particular period of time, especially when one could have been doing something more fun or productive. A noun or pronoun can be used between "sleep" and "away." No, you can't just sleep away the whole weekend again! I want you out of bed by 10 AM tomorrow, ready to do something outside! I was so rundown from the 'flu that I just slept the whole day away.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
sleep something away
to spend or waste a specific period of time sleeping. You can't sleep the whole day away! Jim slept away his whole vacation.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.