The condition which occurs during early to mid childhood and includes nightmares, sleep terror and sleepwalking is parasomnia.
A parasomnia is a type of sleep disorder that causes unnatural and unpleasant physical occurrences or experiences that keep you awake at night. A parasomnia can happen before, during, or right after waking up from sleep. If you have parasomnia, you might act strangely, move abnormally, speak abnormally, or express your emotions in odd ways.
Any stage of sleep, including the change from awake to sleep and vice versa, can experience the behaviour. If you have parasomnia, you might move, speak, or do odd things while you sleep, have nightmares, or have sleep terrors.
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