why is it bad to wake up a sleepwalker
Sleepwalking is bad because it puts the person at risk of danger like falling down a flight of stairs while sleepwalking. Experts advises sleepwalkers to put away dangerous items and lock doors and windows to reduce the risk of injury.
Waking up a sleepwalker can startle them and they may become frightened or disorientated. If they are putting themselves in danger then you will need to calmly talk to them and lead them back to bed.