What is the optimum temperature for sleep?

What is the optimum temperature for sleep?

Chris Idzikowski (Director of the Edinburgh Sleep Centre) gives expert video advice on: What environmental factors can affect sleep?; Does sharing a bed with a partner affect sleep?; Does sharing a bed with a pet affect sleep? and more...

We tend to recommend around seventeen degrees Centigrade, so slightly cooler room, but it's the same thing. One needs to be cozy when one goes to bed, and then the temperature needs to run down a little bit.