https://marco.org/2007/06/19/parents-check-in-on-their-kids-every-so-often
Parents “check in” on their kids every so often during nap or night time. As an outsider, you think that it is simply to see how the child is doing and is an act of love. In actuality, it is to see if the kid is dead or not breathing. The relief gained from having a not-dead child is priceless.