To pass from a state of wakefulness into sleep.(verb)
To die (often seen on gravestones)(verb)
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Use "fall asleep" in a sentence
"It was a long song and it played so often on the radio that I would fall asleep to Hey-ey Jude, Jude, Judy!"
"You can improve your ability to fall asleep and stay asleep by using a well-formulated nutritional supplement that features a combination of proven vitamin, mineral, herbal, and other natural ingredients to support your sleep cycle naturally and safely."
"Make sure to set your alarm in case you lovebirds fall asleep during go time."