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Be sure to tell your doctor about any prescription or non-prescription medications you might be taking, as well as stimulants such as coffee.

He or she may also want to interview your sleeping partner about your sleep patterns, as your partner may observe aspects of your behaviour during sleep of which you are unaware. Your doctor may also ask you and your partner to keep diaries of your sleep patterns for a few weeks.

Diagnostic tests
In most cases, the cause will become apparent through the medical history and physical examination.

If there is evidence of an additional sleep disorder, such as sleep apnoea, your doctor may recommend a sleep study, or "nocturnal polysomnography". These studies are usually done in a sleep laboratory in a medical centre, where you spend the night in a hospital-type room while specialised machines monitor your heart, lung, brain and muscle activity.

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