Modern tech is accused of interfering with our sleep, keeping us up late anxiously staring at our phone screens. But could a phone app provide the cure?

Roughly one in three people in most developed countries typically tell surveys that the suffer from insomnia. The BBC's Laurence Knight is one of them. He seeks the advice of sleep physician Dr Guy Leschziner of Guy's Hospital in London, who explains how sleep and anxiety can become a vicious circle.

The good news is that there is a new non-drug treatment that is proving remarkably successful - cognitive behavioural therapy for insomnia. The bad news is that there are nowhere near enough trained clinicians able to provide treatment. That provides a gap in the market - and one that Yuri Maricich of US medical tech firm Pear Therapeutics hopes to fill with a mobile phone app of all things.

(Picture: Cell phone addict man awake at night in bed using smartphone; Credit: OcusFocus/Getty Images)