Delta band

0.5 to 4 Hz Delta

Delta is the dominant band of deep, slow-wave sleep. Auditory stimulation timed to slow oscillations has been shown to enhance them in controlled studies.

What the evidence says

The link between slow-wave activity and restorative sleep is well established, and closed-loop acoustic stimulation of slow oscillations has measurable effects in the lab.

A passive delta binaural beat is not the same as the closed-loop stimulation used in those studies. We frame delta sessions as a calm bed for winding down, not a sleep prescription.

How we measure it

Carrier 200 Hz with a small delta differential (for example 202.5 Hz right for 2.5 Hz). Level published at around minus 22 dB, subtle for overnight use.

References

• Ngo, H.-V. V., et al. (2013). Auditory Closed-Loop Stimulation of the Sleep Slow Oscillation Enhances Memory. Neuron.
• Besedovsky, L., et al. (2019). The Sleep-Immune Crosstalk in Health and Disease. Physiological Reviews.

Not medical advice. These sessions support relaxation and general wellness.