Question 98 of 433
How much sleep do I actually need?
The short answer
Most adults need about seven to nine hours, with individual and age-related variation. Regularly getting less than six is linked to more heart disease, diabetes, weight gain, depression, and dementia.
Sleep supports memory and many restorative processes. Brain-fluid clearance research is developing, particularly in animals; it does not yet establish that a particular amount of deep sleep prevents Alzheimer’s disease. Blood pressure dips. Hormones reset. Memory is filed. Dr. Matthew Walker’s Why We Sleep made this case to millions. A few of his claims were stronger than the data, but the central message holds.
“This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship.” From the book’s medical disclaimer. Full disclaimer
CONSENSUS / OBSERVATIONAL — Adults: sleep-duration guidance and health associations; disease-prevention mechanisms remain under study.Evidence grade (draft mapping)GGuideline-based / consensusPart 7, Q98 · Part sources
From Longevity Unmasked by Afshine Ash Emrani, MD, FACC. Medical disclaimer. This book is for education. It is not medical advice, and reading it does not make you my patient or create a doctor-patient relationship. Nothing here is meant to diagnose, treat, cure, or prevent any disease. Medicine is personal: a test, drug, supplement, or exercise plan that helps one person can harm another. Do not start, stop, or change any medication or treatment because of something you read in these pages. Talk with a licensed clinician who knows your history first. If you think you are having a medical emergency, call 911. The author disclaims responsibility for any loss or harm arising from use of the information in this book.