Here Are The Best Sound Types For Falling (And Staying!) Asleep, According To Doctors
including purple noise, gray noise, and even black noise (a.k.a. good ol’ fashioned silence), to name a few. A simple crash ...
来自MSN1 个月
Doctors say this type of noise is best for deep sleep
including purple noise, gray noise, and even black noise (a.k.a. good ol’ fashioned silence), to name a few. A simple crash course: Each noise colour has its own range of sound wavelengths ...