Final answer:
A nurse will use a polysomnogram to complete a sleep assessment on a patient, which records various biophysiological changes during sleep and helps in diagnosing sleep disorders.
Step-by-step explanation:
The nurse completing a sleep assessment on a patient will most likely use the polysomnogram as the tool to complete the assessment. A polysomnogram is a comprehensive recording of the biophysiological changes that occur during sleep. This test is typically performed in a sleep lab and is the most accurate way to diagnose sleep disorders such as sleep apnea, narcolepsy, and parasomnias. It monitors several body functions including brain waves, eye movements, heart rate, and muscle activity.