Question

what is mean by nightmares​

Answer 1

Explanation:

Frightening dreams, usually during REM sleep, that are normal and common in children under 10 and can also affect teens and adults.

COMMON CAUSES

Nightmares can have causes that aren't due to underlying disease. In children, it's a regular stage of the development process. Causes include scary movies and books, individual experiences or medication side effects.

Answer 2

Answer:

frightening or upleasent dream