REM occupies 20–25% of a healthy night and is heavily back-loaded, so cutting sleep short by an hour can remove a disproportionate share of it. REM suppression is strongly associated with alcohol, cannabis, SSRIs, and sleep deprivation; rebound REM after abstinence is normal. Lower REM percentage in large cohort studies is associated with higher all-cause and dementia risk, making it a marker worth tracking over months rather than reacting to night by night.
Measured at Longevity Cliniq
See your own REM Sleep number.
Every Longevity Cliniq panel includes the markers that drive healthspan, interpreted by a physician — across Dubai, Abu Dhabi and the wider UAE.