Wellness vocabulary that exploded with smartwatch and Apple Health adoption — apps now show 深度睡眠 (deep sleep), 浅睡眠 (light sleep), and an overall 睡眠评分 (sleep score). Common topic of Xiaohongshu and lifestyle content among urban young adults.
usage
质量 (zhìliàng) here means 'quality' (the level of excellence). Note 质量 in physics also means 'mass' — context disambiguates. Compare 睡眠时间 (shuìmián shíjiān, sleep duration) — quality vs quantity.
