The Nightmare is a painting by Johann Heinrich Füssli (who was also known as John Henry Fuseli). He painted it in 1781

A nightmare is a very powerful dream that the sleeper finds disturbing or frightening. Nightmares usually have either physiological causes, like a high fever, or psychological ones, like trauma or stress in the sleeper's life. Nightmares are common, but nightmares that happen very often can cause problems with sleep. They may cause people to get medical help.

Nightmares usually happen during REM sleep. view more...