A light emitting device includes a carrier and a light emitting device arranged on the carrier. When in use, the carrier is inserted into the ear so that the light emitting device is positioned in the ear and irradiates light into the ear canal, thereby improving the sleep quality of the user.一種發光器，係包括：承載件以及設於該承載件上之發光件，以於使用時，將該承載件塞入耳內，使該發光件位於該耳內並朝耳道內照射光線，藉此提升使用者之睡眠品質。
