Pupil response suggests autistic people have atypical activity in a part of the brain that regulates attention.

Many people with autism have difficulty falling and staying asleep, but there may be ways to help them.

The signaling imbalance theory holds that the brains of autistic people are hyper-excitable because of either excess neuronal activity or weak brakes on that activity.

A growing body of evidence suggests that autism involves atypical communication between brain regions, but how and where in the brain this plays out is unclear.