Obstructive sleep apnoea affects up to 4% of the population, but the majority of cases are undiagnosed.

BBC: Rural risk for sleep disorder Scots

Among the conditions examined by the St Thomas' team were obstructive sleep apnoea (OSA) and restless leg syndrome (RLS).

BBC: NEWS | Health | Genes to blame for restless sleep

The BLF's map was produced by combining known risk factors for Obstructive sleep apnoea - such as obesity, age and sex - with demographic information.

BBC: Rural risk for sleep disorder Scots