TO GOOD SLEEP

Maximizing the Effects: The "Correct Usage"
[Sleep Music Timeline]
30 minutes before bedtime: Start playing at 20% volume (to stop the brain's idling).
Get into bed: Close your eyes and match your breathing (inhale for 4 seconds, exhale for 8 seconds) to the music's tempo.
Falling asleep: Set the timer to automatically stop after 60 minutes (to prevent waking in the latter half of sleep).
Volume should be below a "whisper" level (30-40 dB).
A level that is "barely audible" is optimal. If the sound is too loud, the brain tries to analyze the sound, activating the auditory cortex.
Direct listening from your smartphone is a no-no. Speaker placement is crucial.
If you place your smartphone by your pillow and listen directly, the high frequencies will be harsh on your ears. Place the speaker on the floor at least 2 meters away from the bed, or facing it towards a wall, and listen as indirect sound (sound that resonates throughout the room). This is the closest to natural sound.
Sleep timers are essential.
Humans perceive sound even while sleeping. If sounds continue to play during REM sleep (light sleep), your brain won't be able to rest properly. Please be sure to set it to automatically turn off within 60 minutes.