It might sound silly, but I can't sleep at night without my child ? So…

It might sound silly, but I can't sleep at night without my child ? Sometimes his grandmother rocks him and he sleeps with her for half the night until the first feeding, sometimes he falls asleep in the crib. And I can't fall asleep at that moment, until he wakes up to eat and the second half of the night we wake up together How to get rid of this and sleep peacefully ?