In role-playing games, metagaming is a term often used to describe players' use of assumed characteristics of the game.
Various factors can contribute to sleep terrors, such as: 1  Sleep deprivation and extreme tiredness. 2  Stress. 3  Fever (in children). 4  Sleeping in unfamiliar surroundings. 5  Lights or noise. 6  An overfull bladder.
Sleep terrors are different than nightmares in that they occur during non-REM sleep, while nightmares typically happen during REM sleep. Sleep terrors usually occur early in the night and can include arousal, agitation, large pupils, sweating and increased blood pressure for the sleeper. The sleeper typically does not remember the dream by the time they wake up[1].