128 Hz to Sleep, Rest, Study | Black Screen | 30 Minutes

128 Hz pure tone for 30 minutes on a completely black screen. Press play, turn the brightness down or put your phone face down, and let it run. ABOUT 128 HZ 128 Hz is 2 to the 7th power, and the note C in "scientific pitch", the tuning where every C is a power of two. A 128 Hz tuning fork is the one commonly used by doctors to test vibration sense in the hands and feet. As a tone for sleep or study it has no particular research behind it. It is here as a clean, low reference tone with a very steady character. Soft harmonics (256, 384 and 512 Hz) are added so it stays audible on small speakers. The base tone stays exactly 128 Hz. – HOW TO USE Set the volume low, press play, then turn the brightness all the way down or put your phone face down. The screen stays black for the whole video. THE SOUND One steady tone, generated digitally on the exact frequency in the title. No music, no voice, no visuals. OTHER LENGTHS More lengths (15, 20, 45 and 60 minutes) are coming soon. See the playlists on the channel. GOOD FOR Falling asleep, resting, studying, reading, meditation and quiet background focus. NOT MEDICAL ADVICE Frequency tones are not a treatment for any condition. Research on frequency-specific effects is limited and mixed. If you have trouble sleeping or concentrating over time, talk to a doctor. – Created by Ricardo Valera García. – 128 hz, 128 hz tone, 128hz black screen, 128 hz 30 minutes, 128 hz sleep, 128 hz tuning fork, scientific pitch C, black screen frequency, frequency tone, pure tone, sleep sounds, study sounds – #128hz #blackscreen #sleepsounds