Experiments compared mice aged 20 days, one year and two years, finding that effects on stress responses diminished in old age.Experiments compared mice aged 20 days, one year and two years, finding that effects on stress responses diminished in old age.
An observational study followed 462 healthy adults for a year, finding stronger health links using individual sleep cut-offs than a fixed six-hour limit.An observational study followed 462 healthy adults for a year, finding stronger health links using individual sleep cut-offs than a fixed six-hour limit.