Hypnagogic

By

Adjective: relating to the state immediately before falling asleep.

The opposite transitional state from sleep into wakefulness is hypnopompic.

H Ellis, writing in A Note on Hypnagogic Paramnesia in 1897 was of the opinion that the word hypnopompic was a pedantic addition in that falling asleep or coming awake from sleep was the same state.