Hypnagogia
Hypnagogia refers to the state of mind experienced just before falling to sleep. Some people learn to extend this in-between state and some use it as an entry point for lucid dreaming. I believe I am safe in regarding the 1991 tome by Andreas Mavromatis as the definitive work in this fascinating realm of human experience. Like Robert Waggoner's book on Lucid Dreaming, Mavromatis includes an appendix in which he provides methods and procedures for prolonging this state.
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