from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A period of regular restful sleep, especially when attained by going to bed early.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun idiomatic
Extrasleep or a special nap.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun sleep before midnight
from The American Heritage® Dictionary of the English Language, 4th Edition
[From the belief that such sleep helps preserve an attractive and youthful appearance.]
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