Retail store service featuring electronic apparatus for measuring brainwaves for non-medical purposes, wearable electronic headband devices for brainwave modulation using cranial electrotherapy stimulation (CES) technology, wearable electronic biometric signal scanners, sensors and transmitters, electrical biometric stimulation device for stress relief for non-medical purposes, electrical stimulation devices for enhancing brain health, electronic biometric monitoring apparatus for brain stimulation, not for medical purposes, electronic biometric signal scanners, sensors and transmitters utilizing brainwaves for sleep, biorhythm, and stress management, not for medical purposes, downloadable and recorded computer software for receiving, processing, transmitting, and displaying sleep state information, downloadable and recorded computer software for sleep management and diagnosis of sleep disorders using artificial intelligence, downloadable smartphone computer application software for sleep management and diagnosis of sleep disorders, downloadable computer software for remote monitoring and analysis of biometric and brainwave data, medical apparatus and instruments for use in measuring and transmitting biometric signals and for the treatment of sleep and stress disorders, medical device for sleep state analysis, electrical nerve stimulator apparatus, cranial electrotherapy stimulation apparatus comprising electrical nerve muscle stimulators for use in sleep management, cranial electrotherapy stimulation apparatus comprising electrical nerve muscle stimulators for use in concentration and stress management; advertising; sales promotion services; providing consumer product recommendations; organisation of exhibitions for commercial or advertising purposes