Deep sleep—the body’s most restorative stage—is essential for tissue repair, immune support, and memory consolidation. Low-frequency sounds, such as delta waves (0.5–4 Hz), brown noise, or slow ambient tones, can help the brain enter and maintain this stage. These sounds work through brainwave entrainment, encouraging slow-wave sleep, masking disruptive noises like traffic or snoring, and calming the nervous system by lowering heart rate and stress hormones.
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