Middle-of-the-night insomnia
（重定向自Middle insomnia）
Middle-of-the-night insomnia (MOTN) is characterized by having difficulty returning to sleep after waking up during the night or very early in the morning. It is also called nocturnal awakenings, middle of the night awakenings, sleep maintenance insomnia, and middle insomnia. This kind of insomnia (sleeplessness) is different from initial or sleep-onset insomnia, which consists of having difficulty falling asleep at the beginning of sleep.