During a lucid dream it is possible for the dreamer (or “oneironaut,” as LaBerge puts it) to think reasonably clearly, remember the conditions of waking life and act voluntarily, all while remaining soundly, restfully asleep.
Source: wiktionary
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Keep "oneironaut" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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2 total sentences available.
During a lucid dream it is possible for the dreamer (or “oneironaut,” as LaBerge puts it) to think reasonably clearly, remember the conditions of waking life and act voluntarily, all while remaining soundly, restfully asleep.
Source: wiktionary
Without special training, he was a natural “oneironaut” or “dream navigator.” From early childhood, he could control his dreams. He used to “wake up” within a dream. Fully lucid, he was aware he was dreaming.
Source: wiktionary
Closest matches include dreamer.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.