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Page 22 of 35 Huang et al. Soft Sci 2024;4:40 https://dx.doi.org/10.20517/ss.2024.37

Figure 9. (A) Multi-channel data acquisition system for sleep state monitoring. One pixel corresponds to one TENG unit with a pressure
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sensitivity of 0.77 V·Pa ; (B) The UI showing sleep states information including posture, position, and pressure distribution; (C) The
diagram showing the press number distribution of a sleeper throughout the night; (D) Automatic warning function of smart bedsheet;
(E) Auxiliary warning function of smart bedsheet [42] . Reprinted with permission. Copyright 2017, John Wiley and Sons; (F) Schematic
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illustration of a smart bedsheet integrated functional fibers with a high sensitivity of 10.79 mV·Pa ; (G) Design of an integrated system
containing sensing array, signal amplifiers, multi-channel processing, ADC, Bluetooth transmitter, and mobile terminal; (H) The
flowchart of the obstructive sleep apnea-hypopnea syndrome monitoring and intervention system; (I) Photograph showing the patient is
awakened by the system in abnormal situations [243] . Reprinted with permission. Copyright 2020, Elsevier. TENG: Triboelectric
nanogenerator; UI: user interface; ADC: analog-to-digital converters.

from the bed, signals from five TENGs along the edge of the mattress are sent to a computer or mobile
terminal, triggering an alarm signal [Figure 9D]. Besides, they can autonomously call for help by touching