Have a night light. Leave the door open. And a stuffed animal or special blanket with them. Tell your kid before they go to bed to think of a good thought or a favorite memory before they go to sleep. Tell them a fun story about them like when they went to the park and met some new friends and saw some animals that they remember and include some fun fictional parts then before they go to sleep they will think about that fun day at the park. I hope this helps:)