Research has shown that a variety of factors contribute to sleepwalking episodes. Sleepwalkers are usually operating under severe lack of sleep or have na irregular or hectic sleep schedule. Often, they are under great amounts of stress or anxiety. Some medical conditions, such as abnormal heart rhythms, nighttime seizures, and sleep apnea, have been known to cause sleepwalking. Sometimes a person who has taken a certain medication experiences a sleepwalking episode. Claim 1: Some outside influences make a person more likely to sleepwalk. Claim 2: If your mother was a sleepwalker, it is more likely that you will be, too. Claim 3: When people are sleepwalking, they are not aware of their surroundings. Claim 4: Going to bed at the same time every night can help some children not sleepwalk. Which two claims are supported by the source above?