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sleepless

[sleep-lis] /ˈslip lɪs/
adjective
1.
without sleep:
a sleepless night.
2.
watchful; alert:
sleepless devotion to duty.
3.
always active:
the sleepless ocean.
Origin
late Middle English
1375-1425
1375-1425; late Middle English; see sleep, -less
Related forms
sleeplessly, adverb
sleeplessness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sleeplessness

sleepless

/ˈsliːplɪs/
adjective
1.
without sleep or rest: a sleepless journey
2.
unable to sleep
3.
always watchful or alert
4.
(mainly poetic) always active or moving: the sleepless tides
Derived Forms
sleeplessly, adverb
sleeplessness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sleeplessness

sleepless

adj.

early 15c., from sleep (n.) + -less. Old English had slæpleas but the modern word seems to be a re-formation. Cf. German schlaflos, Dutch slapeloos. Related: Sleeplessly; sleeplessness.

Online Etymology Dictionary, © 2010 Douglas Harper
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