Henry was dreaming, but he knew that he was dreaming.During his dream he was able to control some of the events that occurred in the dream.In this case, Henry is

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Henry is having a lucid dream, where he is aware that he is dreaming and can control some of the events that occur in the dream. Lucid dreaming can occur during any stage of the sleep cycle. Theta waves characterize Stage 1 and 2 of the sleep cycle, while Stage 3 and 4 are characterized by delta waves. Pseudo-REM sleep is a condition where a person exhibits REM-like brain activity during non-REM sleep, but does not control the dream events like in a lucid dream.

Henry Was Dreaming, but He Knew That He Was Dreaming