Hypnagogia
（重定向自Hypnogogic）
Hypnagogia is the experience of the transitional state from wakefulness to sleep: the hypnagogic state of consciousness, during the onset of sleep. In contradistinction, hypnopompia denotes the onset of wakefulness. The related words from the Greek are agōgos "leading", "inducing", pompe "act of sending", and hypnos "sleep".