Diagnostic daytime multiple sleep latency test (MSLT) is used to diagnose narcolepsy and to measure the degree of daytime sleepiness. It measures how quickly you fall asleep in quiet situations during the day. It also monitors how quickly and how often you enter REM sleep. To ensure accurate results, it’s performed on the morning following a diagnostic overnight PSG.

Two-night evaluation PSG and CPAP titration. On the first night, you’ll have general monitoring and diagnostic evaluation. If sleep apnea is discovered, you’ll come back for a second night to determine the right air pressure for CPAP (continuous positive airway pressure) treatment. It delivers air into your airways through a specially designed nasal mask.

Split-night PSG with CPAP titration is done when moderate or severe sleep apnea has been discovered or strongly suspected during the first part of the night’s study. The second half of the night is used to determine the CPAP pressure needed to offset apnea.