Waking someone who is sleepwalking will cause a heart attack or psychological damage.
Waking a sleepwalker is safe and generally recommended to prevent injury or dangerous behaviour. While people may be confused or disoriented upon waking, no medical evidence supports that it causes heart attacks or serious harm. Sleep researchers recommend gentle guidance back to bed rather than forcing them awake if safe.
Reception
Sources
- Sleepwalking - Mayo Clinic PRIMARY
- Snopes: Waking Sleepwalker REFERENCE