Depending on your situation, the diagnosis of insomnia and the search for its cause may include:
- Physical exam. If the cause of insomnia is unknown, your doctor may do a physical exam to look for signs of medical problems that may be related to insomnia. Occasionally, a blood test may be done to check for thyroid problems or other conditions that may be associated with poor sleep.
- Sleep habits review. In addition to asking you sleep-related questions, your doctor may have you complete a questionnaire to determine your sleep-wake pattern and your level of daytime sleepiness. You may also be asked to keep a sleep diary for a couple of weeks.
- Sleep study. If the cause of your insomnia isn't clear, or you have signs of another sleep disorder, such as sleep apnea or restless legs syndrome, you may need to spend a night at a sleep center. Tests are done to monitor and record a variety of body activities while you sleep, including brain waves, breathing, heartbeat, eye movements and body movements.