Tiredness and lethargy are a result of many things, and are caused by factors only relevant to you, your health and your lifestyle, both physical and psychologically. Stress, too much or too little exercise, poor diet, too much alcohol, insomnia, sleep apnoea, underactive thyroid, adrenal dysfucntion, aneamia, hormone imbalance, restless legs are some of the reasons we can feel tired and lethargic. Reflexology is one therapy that can boost your energy levels and make you feel brighter. The Revs massage insole works in a similar way to a Reflexology therapy, with the nodules massaging and stimulating the adrenal glands, the pituitary gland, the thyroid gland, and the pineal gland (the sleep gland). Working all these glands will help to rebalance and trigger them into functioning better. Revs also works your diaphgram which will help you to relax.