sleepless

[sleep-lis]
adjective
1.
without sleep: a sleepless night.
2.
watchful; alert: sleepless devotion to duty.
3.
always active: the sleepless ocean.

Origin:
1375–1425; late Middle English; see sleep, -less

sleeplessly, adverb
sleeplessness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sleepless (ˈsliːplɪs)
 
adj
1.  without sleep or rest: a sleepless journey
2.  unable to sleep
3.  always watchful or alert
4.  poetic chiefly always active or moving: the sleepless tides
 
'sleeplessly
 
adv
 
'sleeplessness
 
n

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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Example sentences
They will spend sleepless nights marking the calves before moving the reindeer
  to their summer grazing grounds in the fjords.
If you have a sleepless night or chronic insomnia, you also tend to eat more at
  night.
The idea was cooked up during a sleepless night while contemplating his career.
Not that this sleepless business ends after a certain age.
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