the time at which a person usually goes to bed: It's past my bedtime.
the time at which a person goes to bed on a particular night: I have to get up early tomorrow so bedtime tonight will be 9 o'clock.

1200–50; Middle English; see bed, time Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bedtime (ˈbɛdˌtaɪm)
a.  the time when one usually goes to bed
 b.  (as modifier): a bedtime story

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-13c., from bed + time.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Many of us enjoy an occasional bedtime chat with a loved one who is far away.
We did not have the benefit of having stories read to us at bedtime, and
  unfortunately went to bed hungry far too often.
When gathered around the stove before bedtime, veterans of these stations
  sometimes tell newcomers a cautionary tale.
There is no fixed bedtime, and no one tells anyone else to go to sleep.
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