SOMNIUM combines binaural beats, calibrated noise spectra, and natural biophony so you can shape attention, rest, and calm from the browser — with no account required.
Brainwave Entrainment (FFR)
When each ear receives a slightly different pure tone, the auditory pathway produces a frequency-following response (FFR): a faint electrical rhythm at the difference between those tones. Delta beds near 0.25–2 Hz support the slow oscillations of deep N3 sleep; theta near 6 Hz is linked with quiet meditation; alpha near 10 Hz and beta near 15 Hz map onto calm reading and high-intensity working memory. Stereo headphones let the brainstem hear that difference as a beat rather than two unrelated notes.
Therapeutic Noise Spectra
Not all masking noise is equal. Pink noise loses 3 dB per octave and has been studied as a stabilizer of slow-wave (N3) sleep, reducing brief arousals without a harsh hiss. Brown noise falls faster (−6 dB/octave), concentrating energy in the sub-bass; many people with ADHD use that stochastic resonance to hold attention. Green noise sits in a mid band around 500 Hz, softening mental fatigue while remaining alert. White noise remains a high-barrier masker for intermittent city sounds.
Biophony and Cortisol Reduction
Rain, wind, forest night, and distant thunder are forms of biophony and geophony: fractal, non-threatening textures that help the amygdala stand down from hypervigilance. Soft, continuous natural beds are associated with lower perceived stress and can ease the physiological arousal that keeps cortisol elevated. Mixed with a binaural carrier, they give the nervous system both a safe spatial scene and a rhythmic cue to slow down.