The experts: Cardiologists on 20 simple, successful steps to a healthy heart

Our hearts are muscles and need proper fuel and rest. Here is how to keep yours on top form – from avoiding cocaine to watching your cholesterol

Giraffepods, hot masks and a massage pillow: testing Japan’s answers to the perfect power nap

In a country where more than 40% get less than six hours’ sleep a night and millions nap at work, new ways to grab forty winks are big business

Tell us: what are your super-specific tips for getting to sleep?

We want to hear about the elaborate routines and items people use to get some shut-eye

Scientists name eight measures that can slow ageing by up to six years

Measures including healthy sleep and regular exercise may slow pace of body’s biological ageing

Everything from our sleep to our hormones relies on the dark. So why are we so intent on destroying it?

Humans have always feared the night – and now we are wiping it out, one streetlight at a time. That’s terrible news for our bodies and minds – and the rest of nature

Has the time come to stop changing the clocks? This is what the science tells us

The EU voted to scrap mandatory daylight savings time but it seems unlikely Brexit Britain will do the same, says Kit Yates, director of the Centre for Mathematical Biology at Bath University

Time for separate beds? What to do when your partner snores, hogs the duvet, can’t sleep without a light on …

It’s hard not to hate someone whose sleeping style keeps you awake night after night. Here’s how everyone can get some shuteye

Don’t listen to Arnold Schwarzenegger – join the rest and relaxation resistance!

Arnie’s brand of hustle culture is taking a bashing online and I am all for it. Do less, enjoy more and take that nap, writes Emma Beddington

Should I worry about being tired all the time?

Is modern life making us ill – or are we just a little underslept?

Sleeping less than five hours a night can raise depression risk, study suggests

Consistently short sleep duration more likely to precede symptoms than inverse, genetic data reveal