My husband works a night shift. He leaves right after we put our kids to sleep and gets home right before they get up. So he has to sleep during the day. Our kids are 1 and 4 and they are terrible about letting him sleep. They whine about getting him up and are horribly loud all day. I feel bad because I know it's hard for him to get any sleep. We live in a smaller one story house so them being noisy really is a problem. Any ideas on how to get them to understand they need to quite down and let him sleep?