Theta waves (4-7 Hz) are common in the lighter stages of sleep or the transition from waking to sleeping. Delta waves (0.5-4 Hz) signify a state of deep sleep. A binaural beat with a frequency ...

Proof, then, that this is deep sleep music at its best. Brian Eno – Ambient 1: Music for Airports (1978) A defining ambient album, Brian Eno’s Music for Airports was originally designed to ...