Sleep is crucial for people of all ages and new research suggest that seven hours a night is the magic number for those in middle to older age.
Also, findings show both too much and too little sleep are tied to poorer brain function and mental health, according to researchers from Cambridge University and Fudan University in China.
The news is based on results of scientific data examination of 500,000 adults between the ages of 38-73, from the UK Biobank.
