Wiktionary
fall asleep
vb. 1 To pass from a state of wakefulness into sleep. 2 To be affected by paresthesi
3 (label en poetic euphemistic) To die (qualifier: often seen on gravestones).
WordNet
Usage examples of "fall asleep".
When you speed-Heal, they build up faster than the body can get rid of them, and the person you're Healing tends to fall asleep a lot.
How wonderful it had been to fall asleep in his arms and be awakened at dawn to find him between her legs, kissing her pussy.