drift off

When you drift off, you fall asleep gradually and peacefully. If you woke up early this morning, you may drift off as you lounge on the couch watching TV tonight.

To drift off is to be taken and carried into sleep, the way a boat might drift away on the water. Like other phrases formed with drift, including drift apart, this one implies passive rather than deliberate movement. You may find yourself starting to drift off while you sit through a boring lecture, or when you're extremely sleepy, as your head first hits the pillow in your bed at night.

Definitions of drift off
  1. verb
    change from a waking to a sleeping state
    synonyms: dope off, doze off, drop off, drowse off, fall asleep, flake out, nod off
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    arouse, awake, awaken, come alive, wake, wake up, waken
    stop sleeping
    zonk out
    fall asleep fast, as when one is extremely tired
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