Monitoring Sleep With a Head-Tracking Smart Pillow – Self-Powered With Triboelectric Nanogenerators

Tracking Sleep With Self-Powering Smart Pillow

This self-powering smart pillow can track the position and motion of the head during sleep. Credit: Haiying Kou

Sleep is critical for good physical and mental health. Yet many people have trouble falling asleep or staying asleep, resulting in not enough sleep. While recent research suggests that 7 hours is the ideal amount of sleep for adults, many people struggle to even get that much on a regular basis.

Fortunately, scientists are working on the problem, and one of the ways is through better monitoring of sleep. A new self-powering smart pillow that tracks the position of the head could help.

The human body needs sleep as much as it needs food and water. Yet many people fail to get enough, causing both mind and body to suffer. People who struggle for shut-eye could benefit from monitoring their sleep, but they have limited options for doing so. In a new study in ACS Applied Materials & Interfaces, one team describes a potential solution: a self-powering smart pillow that tracks the position of the head. 

Studies have linked chronic lack of sleep to physical ailments, such as diabetes and heart disease, as well as mental health issues. Those interested in getting a better handle on what’s happening to them at night have two primary options. They can take a sleep test conducted in a medical facility, or they can use an app through a smartphone or smart watch — a much more convenient, but less accurate choice. Recognizing the need, many groups have begun developing new sleep monitoring systems using triboelectric nanogenerators (TENGs). These self-powering systems have taken the form of eye masks, belts, patches, and even bed sheets. Ding Li, Zhong Lin Wang, and their colleagues wanted to adapt this approach to create a less restrictive, more comfortable version that focuses on the movement of the head during sleep.

To construct this new smart pillow, the researchers formulated a flexible, porous polymer triboelectric layer. Movement between the head and this layer changes the electric field around nearby electrodes, generating a current. They strung together several of these self-powering sensors to create a flexible and breathable TENG (FB-TENG) array that can be placed atop an ordinary pillow. This system could generate voltage that corresponded to the amount of applied pressure, and it could track the movement of a finger tracing out letters. The FB-TENG also could capture the pressure distribution of a fake human head as it shifted position.

This smart pillow could have uses beyond tracking sleep, the scientists say. For example, the system could monitor patients with diseases that affect the movement of the head, such as the degenerative neck disorder cervical spondylosis. What’s more, the smart pillow could be adapted to offer an early warning system for those at risk of falling out of bed, they say.

Reference: “Smart Pillow Based on Flexible and Breathable Triboelectric Nanogenerator Arrays for Head Movement Monitoring during Sleep” by Haiying Kou, Haiming Wang, Renwei Cheng, Yanjun Liao, Xue Shi, Jianjun Luo, Ding Li and Zhong Lin Wang, 14 May 2022, ACS Applied Materials & Interfaces.
DOI: 10.1021/acsami.2c03056

The authors acknowledge funding from the National Key Research & Development Project from the Ministry of Science and Technology of the People’s Republic of China and the National Natural Science Foundation of China.

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