Many people talk in their sleep. Half of all kids between the ages of 3 and 10 years old carry on conversations while asleep, and a small number of adults -- about 5% -- keep chit-chatting after they go to bed. The utterances can take place occasionally or every night. One poll showed that more than one in 10 young children converse in their sleep more than a few nights a week. Girls talk in their sleep as much as boys. And experts think that sleep talking may run in families.