While the body rests in stillness, the dreaming brain enters one of its most metabolically demanding states — a paradox now made measurable by researchers at Tohoku University. Their work with mice reveals that during REM sleep, the brain anticipates its own hunger, flooding itself with blood and fuel before dreaming even begins, yet neurons still fall into energy deficit, consuming ATP faster than it can be produced. This finding suggests that the brain's energy economy is not a simple pipeline but a layered, independently regulated system — one whose very inefficiency in the moment may be th