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If a sleep-disrupting problem is suspected, an overnight sleep lab polysomnogram may be in order.

This may not detect mild apnea and is prone to false negatives, so if results are negative but your doctor strongly suspects apnea, you’ll need a polysomnogram.

You don’t need a polysomnogram to diagnose RLS unless your doctor can’t pinpoint which sleep disorder you have.

To properly diagnose OSA, you’ll need a sleep lab polysomnogram or an overnight home sleep apnea test, where electrodes record breathing and heart rate, blood-oxygen levels and chest movements.

Doctors rely on results from a sleep study, or polysomnogram, done while you're hooked up to electrodes in a sleep lab.