Using a phone in the dark is a bedtime ritual for many people. One message or video after another glides across the screen, killing the short hours before bed. According to data released by the China Sleep Research Society in 2021, 61 percent of Chinese people play with their mobile …

For people today, headphones are an essential part of everyday life: some wear headphones while walking, some wear headphones at dinner, others read books and wear headphones. There are even people who sleep with headphones! This begs the question: does wearing headphones for a long time have any effect on …