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| Sleep monitoring method | Sensor | Monitored data | Test parameters | Advantages | Disadvantages |
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| PSG | Electrode | Human electrical signal | Electroencephalogram, eye movement, mandibular electromyogram, electrocardiogram, oral and nasal airflow, chest and abdominal movements, snoring, blood oxygen saturation, blood pressure before and after sleep | A variety of physiological indicators can be monitored to identify sleep stages | Complicated operation, which affects subjects’ sleep quality, and the cost of sleep assessment is high |
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| Oximetry | Pulse oximeter | Changes in blood volume in the human arteriolar bed | Pulse rate, blood oxygen saturation, perfusion index | The disturbance is small, and simple sleep staging can be realized | Mainly used in laboratory research and difficult to use at home |
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| Intelligent bracelet | Body motion recorder | Movement of the human body in the X-, Y-, and Z-axes | The occurrence and degree of body motion signals, body motion amplitude, and body motion frequency | Low cost, low interference, continuous monitoring for a long time | Too little data are collected to achieve sleep staging |
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| Sleep mattress | Force-sensitive transducer | Pressure change signal between the user and the mattress | Respiratory rate, body movement | Both comfort and the monitoring function allow sleep staging | Difficult to carry and expensive |
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| Video and audio | Infrared, sound sensors | Changes in movement and nasal and mouth sounds during sleep | The state of sleep and wakefulness | The disturbance is small, and simple sleep staging can be realized | Privacy issues |
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| Biological radar | Biological radar | Body movement signal, respiratory signal | Respiratory rate, body movement | Without interference, various physiological parameters can be monitored at the same time to realize sleep staging | Expensive and difficult to promote |
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