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\nTo diagnose a circadian rhythm disorder, your doctor may review your medical history; ask about your symptoms, sleep patterns, and environment; do a physical exam; and order diagnostic tests.
\nYour doctor will want to learn about your signs and symptoms, risk factors, your personal health history, and your family health history to help diagnose a circadian rhythm disorder. To do this, your doctor may do the following:
\nYour doctor may have you undergo or use some of the following tests and measurements:
\nDo you want to learn more about how melatonin, cortisol, and body temperature work in someone with a healthy sleep cycle?
\nWhen you have a healthy sleep pattern, melatonin levels usually start to rise about two hours before your normal bedtime. Melatonin reaches its highest level while you sleep and goes down as you wake up. Your cortisol levels are usually highest early in the morning and fall throughout the day. Cortisol helps prepare your body to wake up. Body temperature typically falls during the night and rises in the early hours of the morning. All these changes are controlled by your circadian clocks.
\nTo rule out other causes of your symptoms, your doctor may do the following:
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