Shawdesh desk:

At least five hours sleep a night may cut the over-50s’ chances of multiple chronic health problems, researchers say.

And they were checked for chronic conditions, including diabetes, cancer and heart disease, over two decades of follow-up:

• Those who slept five hours or less around the age of 50 had a 30% greater risk of multiple ailments than those who slept seven hours
• Shorter sleep at 50 was also associated with a higher risk of death during the study period, mainly linked to the increased risk of chronic disease

Experts generally recommend about seven or eight hours, the researchers, from University College London and Paris Cité University, say.

Why do we sleep?

Scientists do not know for sure, but it is clear that sleep helps the brain process memories and is good for mood, concentration and metabolism.

Sleep is also an opportunity for the brain to be cleared of waste.

Good-sleep tips

•Tire yourself out during the day by keeping busy and active but slow down towards bedtime

•Avoid daytime naps

•Establish a good night-time routine and make sure your bedroom is relaxing and conducive to sleep – thick curtains or blackout blinds, a comfy room temperature and bedding, and no big distractions, such as scrolling on a smartphone in bed

•Reduce or eliminate caffeine and alcohol close to bedtime

•If you can’t nod off, don’t force it or become frustrated – get up and do something relaxing for a bit, such as reading a book, and then return when sleepier

•If you work antisocial shifts, try and have a short nap before your first shift in a run of nights, to transition. If you are coming off nights, try a nap to see you through and then go to bed early that evening