without sleep:
a sleepless night.
watchful; alert:
sleepless devotion to duty.
always active:
the sleepless ocean.
without sleep or rest: a sleepless journey
unable to sleep
always watchful or alert
(mainly poetic) always active or moving: the sleepless tides


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  • Sleep like a log

    Also, sleep like a top. Sleep very soundly, as in I slept like a log, or She said she slept like a top. Both of these similes transfer the immobility of an object to that of a person who is sound asleep (since a top spinning quickly looks immobile). The first dates from the late […]

  • Sleep-like-a-top

    noun 1. a toy, often inversely conical, with a point on which it is made to spin. Idioms 2. sleep like a top, to sleep soundly: After a day of hiking and swimming we slept like tops. noun 1. the highest or uppermost part of anything: the top of a hill 2. the most important […]

  • Sleep mode

    noun an energy-saving standby condition of a computer which can be reactivated by external stimulus, such as touching the keyboard Usage Note computing

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