Sensors for medical use to be worn by a patient to gather human biometric data; sensors for medical use to gather patient physiological data, namely, brain signals, eye movement, muscle movement, dermal movement, head movement, blood pressure, heart rate, respiratory rate, and sounds from inner body such as speech, breathing sounds, and organ sounds; sensors for medical use to gather human movement data, namely, movement of the eyes, skin, head and body while sleeping or during activity; sensors for medical use to gather human eye movement data; sensors for medical use to gather human head movement data; sensors for medical use to gather patient location data; wearable ear, head, eye, and wrist monitors used to measure human biometric data for medical use; light therapy apparatus for improving mental function, physical function, and sleep quality; high and low frequency electromagnetic therapy apparatus; high and low frequency electromagnetic therapy apparatus for improving mental function, physical function, and sleep quality; high and low sonic therapy apparatus; high and low sonic therapy apparatus for improving mental function, physical function, and sleep quality; actuation apparatus for brain stimulation using acoustic signals, visible or infra-red light, and high or low frequency electrical, magnetic, or electromagnetic waves