BBC discusses the clocks changing at the end of daylight saving time, and how that affects sleep and overall health.

1. We’re told to get our eight hours

We often hear that we should all be getting eight hours’ sleep a night. Organisations from the NHS to the US National Sleep Foundation recommend it. But where does this advice come from?

Studies carried out around the world, looking at how often diseases occur in different groups of people across a population, have come to the same conclusion: both short sleepers and long sleepers are more likely to have a range of diseases, and to live shorter lives.

But it’s hard to tell whether it is short sleep that is causing disease or whether it is a symptom of a less healthy lifestyle.