Insomnia involves recurring difficulty sleeping that can affect daytime concentration and mood. NHS advice includes a consistent waking time, a dark quiet bedroom and going to bed when sleepy. Start with an observable change, such as reducing evening caffeine or creating a quiet wind-down routine. Avoid compensating for every bad night with a late morning, and never drive while sleepy. Seek assessment when problems last months or disrupt daily life despite habit changes. Cognitive behavioural therapy may help; sleeping pills are not an automatic long-term solution and can cause dependence.