Experimental data, based upon a total of 212 hypnagogic awakenings contributed by 9 Ss, are presented on the incidence of reports of various forms of hypnagogic mentation and on the relationship of such reports to EEG activity. It was found that mental activity in some form or another was invariably reported throughout the hypnagogic period. Content reported was predominantly visual and lacking in affective intensity and it became increasingly hallucinatory and unamenable to voluntary control as EEG patterns shifted from an alpha EEG to a spindling EEG. Dreamlike reports very similar to REM reports (i.e., dramatic, hallucinatory episodes) were quite common during descending EEG Stages 1 and 2, and, surprisingly enough, also occurred with an alpha rhythm.

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