I have been facing this problem since quite a long now. My 9 months old dd usually wakes up crying (usually during the afternoon nap), sometimes she cries while asleep and then wakes up howling. It takes around 15 mins to pacify her. Nothing seems to settle her easily. Watching her cry, even my son wakes up crying and the situation becomes impossible to manage. It isn't because of stomach ache, hunger etc. What else could possibly be the reason? Is it something normal with the kids? Is there something I can do to comfort them or to avoid such a situation?