drift off
verb1
Idiomatic To fall asleep slowly.
- He went to sleep, lying there under a wing of his plane, and presently Bland himself drifted off into dreams.1919, B. M. Bower, chapter 5, in The Thunder Bird:
2
Idiomatic To lose concentration.
3
Used other than figuratively or idiomatically: see drift, off.
- Synonyms
- nod off