Which of the following methods is NOT used to end a nap during an MSLT?

The method to end a nap during a Multiple Sleep Latency Test (MSLT) includes allowing the test to conclude based on specific conditions related to sleep onset and duration. The correct answer is the method that does not align with these established practices.

Typically, waking the subject at a fixed time, such as 10 minutes, is not standard protocol in the context of an MSLT. The test is conducted with an emphasis on measuring sleep latency and observing natural sleep patterns, which means that a set time frame for waking can interfere with the accuracy of the results.

In contrast, if there is no sleep onset after 20 minutes, it is appropriate to end the nap; this allows the clinician to assess the subject's tendency to fall asleep. Continuing to record for 15 minutes following sleep onset allows for the evaluation of the depth and quality of sleep. Finally, allowing the subject to wake naturally records their actual sleep duration without external interference.

Each of these methods serves to accurately portray the subject's sleep behavior and latency, which is essential for diagnosing sleep disorders, while the method of waking at a set time does not capture the necessary data.