What is the main focus of a split-night sleep study?

The main focus of a split-night sleep study is to diagnose sleep apnea and initiate CPAP (Continuous Positive Airway Pressure) therapy if indicated. This type of study is structured to provide a dual purpose: the first half typically involves diagnosing the presence and severity of sleep apnea through polysomnography, while the second half is dedicated to titrating CPAP therapy in real-time if substantial obstructive sleep apnea is identified during the first portion of the night.

In a split-night study, the initial phase captures sleep patterns, oxygen levels, and apnea events, allowing the technician to observe and record the patient's sleep architecture and any apneic episodes. Once a specific apnea-hypopnea index (AHI) threshold is met, the study transitions to the application of CPAP therapy. This allows for immediate intervention, thus facilitating not just diagnosis but also the commencement of treatment in a single overnight session.

Other options such as assessing overall sleep efficiency or evaluating REM sleep behavior disorder, while important in the context of sleep studies, do not address the core objectives of a split-night study as effectively as diagnosing and treating sleep apnea. The option regarding treating insomnia without medication does not align with the split-night study format, as this approach does not typically lead to immediate therapeutic