A sleep study, also known as a polysomnogram (polly-SOM-no-gram), records your child’s sleep patterns, brain waves, breathing and muscle movements. A sleep study is very helpful in diagnosing breathing, neurological and movement disorders that may occur during sleep. Some of the symptoms that may lead your child’s doctor to order a sleep study are snoring, bedwetting, sleep walking, sleep talking, night terrors, pauses in breathing (sleep apnea), the feeling of being tired all day, falling asleep at school, and/or waking up in the morning still feeling tired