A headband that tickles a nerve in the forehead could help tackle insomnia. Up to 30 per cent of adults suffer from the condition at some point, which is defined as experiencing difficulty getting to sleep or staying asleep, waking up too early and poor-quality sleep. If this occurs for three nights a week or more, and continues for more than three months, it is known as chronic insomnia, which is associated with depression, high blood pressure, heart disease and type 2 diabetes. Chronic insomnia also increases the chance of an accident by four-and-a-half times because of daytime sleepiness. While stress and worry are the main causes of insomnia, other factors can play a part. Certain medical conditions are associated with insomnia including arthritis (because of the pain) and sleep apnoea (where your breathing stops and starts while you are asleep).