drift off

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drift off (third-person singular simple present drifts off, present participle drifting off, simple past and past participle drifted off)

1. (intransitive, idiomatic) To fall asleep slowly. quotations ▼
   • 1919, B. M. Bower, chapter 5, in The Thunder Bird:

     He went to sleep, lying there under a wing of his plane, and presently Bland himself drifted off into dreams.

2. (intransitive, idiomatic) To lose concentration.
3. (intransitive) Used other than figuratively or idiomatically: see drift,‎ off.

• (fall asleep slowly): nod off

See Thesaurus:fall asleep