Research published in Frontiers in Neuroscience from Northwestern University found that syncing pink noise to EEG recordings might have positive outcomes. Pink noise is defined as a soothing sound with each octave possessing equal energy
Patients underwent one night of a sham stimulation followed by pink noise stimulation delivered during slow wave activity. Verbal paired-associate memory was tested before and after sleep.
Researchers found that slow wave activity was enhanced on EEG and sleep-dependent memory storage was improved.