When people reach middle age sleep disturbances become more commonplace. Insomnia is estimated to affect around 8-10 percent of the population constantly and the figure increases if we account for things like physical illness, pain, emotional upsets, work worries and of course depression.

People possibly worry too much about sleep. Most of us have been brought up in the belief that only a good solid night of sleep provides what's necessary for rest and recuperation. A cat-nap during the day...