Nightmare

A Nightmare is a vivid and disturbing dream that happens during Rapid Eye Movement (REM) stage of sleep.  This kind of dream often results in feelings of terror and extreme distress. Nightmares are more common in children rather than in adults. They may be caused by a multitude of factors, including stress, sickness, sleep deprivation, having a meal clost to bedtime, or may come about as a side effect of certain medications.