Hi Welcoe to HCM I have gone thru your query regarding swollen arm while sleep . It can cause due to abnormalities like in bones, joints, muscles, tendons, ligaments, nerves and tissues due to Pain is your body s alarm system. Pain tells you something is wrong and you need to do something. When part of your body is injured or damaged nerves in that area release chemical signals The bone-on-bone contact produces pain, stiffness, difficulty sleeping and the inability to do activities of daily living, work and sports . Many scientists think pain control methods help reduce pain by blocking pain signals. Pain signals are sent through a complex system of nerves in the brain and spinal cord. Some of the nerve pressed due to wrong posture may be the cause of your trouble . For right daignosis , consultation from a physician is advisable , who will give you advise for exray & treatment , whatever he feels fit. Meanwhile You can apply hot water bottel on painfull surface , Give massage mildly with menthol based ointment or oil Wear arm band support Dear in fact,Your body is always fighting something -- an infection, a toxin, an allergen, a food or the stress response -- and somehow it redirects its hostile attack on your joints, your brain, your thyroid, your gut, your skin, or sometimes your whole body. Your immune system is your defense against invaders . Your immune system is your defense against invaders . But when the immune system becomes weak, the disease cells can grow out of control , the disease overpowers So you should not ignore other possibilities , that can be constipation , mental stress , worry , anger . All affect our health badly . Do regular exercise from head to toe and fingers also , deep breathing and meditation ,to strengthen immunity . Take regular balanced diet having all essential nutrients , fiber , protiens , nuts , minerals ,vitamins A ,C, D, in natural form ,suppleents full of antioxidants - Lemon Juice with water , coco nut water , aloe vera juice 30 ml + amla juice , ginger ,garlic Turmeric powder a level Tspoon with a cup of hot milk + almond oil a sppon at bed time alley pain ,inflammation and 8-10 glasses of water daily , All are antioxidents & energetic . Give strength to immunity & resistance from diseases . Take Homeopathic Bryonia 30 / twice a day / 4- 6 days Rhus Tox 30 1 dose / 10 days Hope this helps solves your query .Take care .All the best Don t hesitate to come with further query if you have any .