Medical devices, namely, wearable headsets and earphones, with sensors for monitoring and measuring physiological and neurological signals; Medical diagnostic devices, namely, wearable electronics for assessing cognitive function, sleep health, and neural activity; Medical apparatus for providing feedback and therapeutic interventions based on real-time physiological data; Electroencephalography (EEG) devices for medical purposes; Medical sensors for measuring and analyzing brainwave activity, heart rate, respiratory rate, and other physiological conditions; Skin surface electrodes for use in electrocardiography (ECG), electromyography (EMG), and electroencephalography (EEG) for converting physiological variables from the heart, muscles, and brain into electrical signals