As a kid I was always terrified of the dark and spent a large part of every night staring at the ceiling waiting to fall asleep. Now I have a 4 year old son and I find it really hard to let him cry at night because he's scared. I've been lying with him until he falls asleep, which used to be fine as it was about a 10-15 minute thing. Now it's more like 1-2 hours while I wait for him to fall asleep. It's gotten ridiculous. We've tried just leaving him to it and he screams and cries for us. What do we do?