The present disclosure is in the field of sleep and respiratory care. In particular, the present disclosure provides means and methods for stimulating select muscles of a subject for improving sleep. A wearable device is provided to be worn on the head of the subject and having stimulating electrodes arranged on the wearable device such that when the wearable device is worn by the subject the electrodes contact the subject's skin for transcutaneous stimulation of the subject's facial muscles. For example, the wearable device may include two electrodes for transcutaneously stimulating the subject's left and right masseter muscles and two electrodes for transcutaneously stimulating the subject's left and right pterygoid muscles. Stimulating the masseter and pterygoid muscles causes the masseter and pterygoid muscles to contract, thereby elevating the subject's mandible to decrease respiratory effort during sleep. The present disclosure also provides means and methods for treating the snoring of a sleeping subject.