WebMD Source (WebMD) Night terrors usually happen after 13-15 months of age http://www.webmd.com/sleep-disorders/night-terrors http://www.webmd.com/sleep-disorders/night-terrors WebMD Source (WebMD) WebMD Source (WebMD) http://www.webmd.com/sleep-disorders/night-terrors Source (WebMD) Source (WebMD) WebMD WebMD WebMD Source (WebMD) http://www.webmd.com/sleep-disorders/night-terrors WebMD night terrors night terrors http://www.webmd.com/sleep-disorders/night-terrors Source (WebMD) WebMD WebMD Source (WebMD) night terrors Source (WebMD) webmd.com