What happens to your brain when the days get darker? - video

As the nights draw in, many of us can experience low mood. But for a small proportion of people a more intense depression develops through the winter months. It’s a phenomenon that since the 1980s has been labelled seasonal affective disorder, or Sad, and can be debilitating for sufferers. To find out more about the latest scientific understanding of Sad, Ian Sample speaks to Russell Foster, professor of circadian neuroscience at the University of Oxford. He explains what scientists think the mechanism for the condition could be and what the evidence says about the best way to tackle it.

In the UK and Ireland, Samaritans can be contacted on freephone 116 123. In the US, you can call or text the 988 Suicide & Crisis Lifeline at 988 or chat at 988lifeline.org. In Australia, the crisis support service Lifeline is 13 11 14. Other international helplines can be found at befrienders.org