You could say that he fell asleep early or that he went to bed early. To say "he slept early" is not idiomatic. Note that you say "her mom" but then "he slept" -- so is your friend male or female?
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Grammar GeekNote that you say "her mom" but then "he slept" -- so is your friend male or female?Sorry, I didn't notice that. She's a she. My bad.