Abstract: A stimulation device is provided, which provides light and sound stimuli capable of inducing the production of melatonin in a human individual subjected to said stimuli. Light and sound stimuli are produced by a light source and a sound emitter connected to a wearable mask or to a wearable frame. The desired stimulation can be easily adjusted by means of mobile devices. A method is also provided based on the stimulation device for optimizing the expression of melatonin in a patient subjected to a periodic and customized treatment. The device and method provide a physical well-being to the individual and are useful for enhancing the performance of athletes and for treating various diseases and symptoms related to low metabolic levels of the melatonin hormone.