#REM

A wave of recent scientific findings underscores that not all sleep is created equal—deep sleep and rapid eye movement (REM) sleep are emerging as key guardians of brain health, with profound implications for dementia risk and cognitive aging. The latest research, recently highlighted in a New York Times report, confirms that beyond simply getting enough hours of sleep, the specific quality and stages of sleep matter deeply for long-term mental wellbeing (NY Times, 2025).

A recent breakthrough study has discovered that the eyes, far from being mere passive players during sleep, actively orchestrate how our brains consolidate memories—guarding old knowledge while seamlessly incorporating new information. These findings, published by a Cornell University research team and highlighted in The Brighter Side of News on April 21, 2025, suggest that subtle changes in the pupil during sleep play a pivotal role in preventing memory “mix-ups” and could one day revolutionize how we learn, remember, and perhaps even treat memory disorders (The Brighter Side of News).