Why Can't Sleep Earbuds Have a Long Battery Life?

The primary reason is that sleep earbuds are designed to be compact, and consequently, the built-in batteries are also small. If we were to extend the battery life, it would necessitate making both the earbuds and the charging case larger, rendering them unsuitable for comfortable wear during sleep.

In reality, for sleep-aid earbuds, their main purpose is to play music to assist you in falling asleep during the pre-sleep period. It is not beneficial for your ears to have sleep-aid music playing throughout the entire night. Once you have fallen asleep and the earbuds run out of power, they can still be worn as physical noise-blocking earplugs, which serve the dual purpose of reducing noise and protecting your hearing.