An hour or two after my school-age son has gone to bed, he sometimes wakes up from a nightmare, walks to my room and mumbles incoherently about what’s scaring him. But he seems off, and I can't get ...

Sleepwalking can happen when you're sleep-deprived, sick, or stressed out and can also be a symptom of a condition such as sleep apnea, restless leg syndrome, or Parkinson's disease. Sleepwalking ...