Indeed, there is a lack of both accurate and non-invasive and durable devices to monitor the human circadian rhythm: often, the devices are invasive (such as for core body temperature sensing), or are inaccurate (wrist PPG instead of ECG, low sampling rate), and even when these two criteria are met, most devices cannot last at least 24h, which makes them unusable to monitor a full circadian cycle, especially for circadian rhythm disorders such as non-24 where one cycle can be much longer than 24h. However, to allow for self-monitoring of the circadian rhythm, a device needs to fulfill at least these 3 criteria (and more). This project aims to provide a set of devices to capture most of the biological signals that can objectively reflect or affect the human circadian rhythm.
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