The Daily Mail reports on non-pharmacological ways to treat depression, including depression caused by insomnia.

HOW IT WORKS: Many sufferers from depression complain of insomnia, but there is now evidence that lack of sleep precedes and even causes depression.

In 2013, researchers at Ryerson University, Toronto, found depression lifted significantly among patients whose insomnia was cured. Treatment consisted of four talk-therapy sessions over eight weeks, and was twice as effective as taking medication or a placebo. This has been described as ‘the biggest advance in depression treatment since Prozac’.