Relax to the ear to ear sound of delta-wave inducing tones. Reference track: delta sleep blue 1 To Learn about SleepPhones, the sleep-friendly headphones: click Classic or Wireless To Rate/Review this podcast: click HERE To Subscribe to more Sleep With Silk podcasts, click the following:  Sleep with Silk: ASMR Triggers Sleep with Silk: Nature Sounds Sleep withSilk: […]