Nature Study Finds U‑Shaped Link Between Sleep Duration and Organ Aging

Overview

• Published in Nature, the analysis used 23 organ‑specific aging clocks built from MRI, plasma proteins, and metabolic data to estimate biological age across the body.
• Both short sleep under six hours and long sleep over eight hours tracked with faster aging in organs including the brain, lungs, liver, pancreas, skin, fat tissue, and the immune system, with the slowest aging between 6.4 and 7.8 hours.
• Short sleep was linked to obesity, type 2 diabetes, hypertension, ischemic heart disease, arrhythmias, COPD, asthma, and several digestive disorders such as reflux and gastritis.
• Long sleep showed stronger associations with neuropsychiatric and brain‑related conditions, including major depression, schizophrenia, bipolar disorder, ADHD, alcohol dependence, and migraine.
• Short and long sleep were also associated with higher all‑cause mortality in this dataset, and the authors stress these are observational links rather than proof of causation, pointing to possible distinct biological pathways that future trials should test.