Every night you hallucinate vividly for two hours. Nobody knows why.
THE NIGHTMARE · HENRY FUSELI, 1781 · PUBLIC DOMAIN
The known landscape
Every night you hallucinate vividly for two hours. Nobody knows why.
Dreams concentrate in REM sleep. Memory consolidation improves after sleep.
The edge
No experiment has established what dreaming is for — every major theory has strong counterexamples.
Contemplative inquiry
Would a person who never dreamed be cognitively impaired?