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

417 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 417 HZ 417 Hz is the second of the six original "Solfeggio" tones, labelled RE, and in that tradition it is linked to "facilitating change". That is a cultural association, not a research finding. It sits close to 415 Hz, the pitch many baroque ensembles use for the note A, so it has a slightly mellow, old-instrument feel. The tone is a single sine wave, generated digitally on exactly 417 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 Jesús Valera García. – 417 hz, 417 hz tone, 417hz black screen, 417 hz 30 minutes, 417 hz sleep, 417 hz solfeggio, solfeggio frequencies, black screen frequency, frequency tone, pure tone, sleep sounds, study sounds – #417hz #blackscreen #sleepsounds