Insomnia is a common condition, but estimates of the prevalence vary depending on the definitions used. One study estimated that 3.3 million people in Canada were affected by insomnia in 2002, whereas the overall prevalence of disturbed sleep was estimated at 37% in Brazil. One population study in Sweden found that, across all age groups, 40% of people have insomnia. Insomnia is often a long-term problem, especially in older people. One UK study showed that 69% of older people with insomnia still had it after 1 year, while in younger age groups this figure was 44%.
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