The demographic features of 296 patients who consulted a sleep disorders centre in the United Kingdom were reviewed. Diagnosis after a sleep study was mainly that of sleep-related breathing disorders; however, various other sleep disorders were also diagnosed. Considering that most sleep disorders are diagnosed only after sleep investigations, it should be emphasized that such a facility should be well prepared in undertaking not only polysomnography but also various sleep investigations, including multiple sleep latency testing and actigraphy. In addition, several treatment options, including sleep hygiene, light therapy, and behavioural therapy, should be available. Therefore, a sleep disorders centre needs to be operated by sleep specialists.