sleep movements

the positional changes of parts of a plant, such as leaves, during the night, which may be brought about by endogenous rhythms or external stimuli.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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These include damaging the watch because of uncontrolled sleep movements or inaccurately monitoring important sleep factors like oxygen levels.

Apple Watch Series 5 Sleep Tracking Feature Is Problematic

One Insurance, a European digital insurer, launched a joint venture with Munich Re called One Coach, which uses encryption technology and factors such as work time, sleep movements and location to craft insurance coverage shaped around customer conditions.

Munich Re, One Insurance Launch Venture

The Zeeq also has an accompanying smartphone app that monitors your sleep movements, snoring pattern and sleep duration ($199.99).

A smart pillow and other sleep innovations Sleep: Nightstands can charge your cellphone