Data from: Light sensors for objective light measurement in ambulatory polysomnography

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Ambulatory polysomnography (PSG) does not commonly include an objective measure of light to determine the time of lights off (Loff), and thus cannot be used to calculate important indices such as sleep onset latency and sleep efficiency. This study examined the technical specifications and appropriateness of a prototype light sensor (LS) for use in ambulatory Compumedics Somte PSG.Two studies were conducted. The first examined the light measurement characteristics of the LS when used with a portable PSG device, specifically recording trace range, linearity, sensitivity, and stability. This involved the LS being exposed to varying incandescent and fluorescent light levels in a light controlled room. Secondly, the LS was trialled in 24 home and 12 hospital ambulatory PSGs to investigate whether light levels in home and hospital settings were within the recording range of the LS, and to quantify the typical light intensity reduction at the time of Loff. A preliminary exploration of clinical utility was also conducted. Linearity between LS voltage and lux was demonstrated, and the LS trace was stable over 14 hours of recording. The observed maximum voltage output of the LS/PSG device was 250 mV, corresponding to a maximum recording range of 350 lux and 523 lux for incandescent and fluorescent light respectively. At the time of Loff, light levels were within the recording range of the LS, and on average dropped by 72 lux (9–245) in the home and 76 lux (4–348) in the hospital setting. Results suggest that clinical utility was greatest in hospital settings where patients are less mobile. The LS was a simple and effective objective marker of light level in portable PSG, which can be used to identify Loff in ambulatory PSG. This allows measurement of additional sleep indices and support with clinical decisions.

随附文件为关联文章提供补充数据集。动态多导睡眠监测（ambulatory polysomnography, PSG）通常不包含用于确定熄灯时刻（Loff）的客观光照测量手段，因此无法计算睡眠潜伏期、睡眠效率等重要睡眠指标。本研究针对一款适配Compumedics Somte型动态多导睡眠监测设备的原型光传感器（light sensor, LS）的技术规格与适配性展开探究。

本研究共开展两项实验：第一项实验针对该光传感器与便携式多导睡眠监测设备联用时的光测量特性进行分析，具体涵盖记录轨迹范围、线性度、灵敏度与稳定性四项指标。实验过程中，将光传感器置于光照可控房间内，使其暴露于不同强度的白炽灯与荧光灯光照环境中。第二项实验则将该光传感器应用于24例家庭场景与12例医院场景的动态多导睡眠监测中，以探究家庭与医院环境中的光照强度是否处于光传感器的记录范围内，并量化熄灯时刻的典型光强降幅。此外，本研究还对该设备的临床应用价值进行了初步探索。

实验证实，光传感器电压与勒克斯（lux，光照强度单位）间呈显著线性相关，且其记录轨迹在14小时的监测过程中保持稳定。经观测，光传感器/多导睡眠监测设备组合的最大电压输出为250毫伏，对应白炽灯与荧光灯的最大记录光照强度分别为350勒克斯与523勒克斯。在熄灯时刻，家庭与医院场景中的光照强度均处于光传感器的记录范围内，其中家庭场景的光强平均降幅为72勒克斯（区间：9–245勒克斯），医院场景则为76勒克斯（区间：4–348勒克斯）。结果显示，该设备在患者活动度更低的医院场景中临床应用价值最高。

该光传感器是便携式多导睡眠监测中简便且有效的光照强度客观标记物，可用于识别动态多导睡眠监测中的熄灯时刻，进而支持额外睡眠指标的测算，并辅助临床决策制定。