1.   It was only when he finally drifted off to sleep that the headaches eased.

2.   Back in her room, she quietly bound the wound with a handkerchief and drifted to sleep.

3.   Stephen, who has been in and out of a spell through the dinner hour, lets out several deep sighs and drifts to sleep.

4.   This increase in cholinergic activity is what makes many people twitch or startle when they are drifting off to sleep, Hobson said.