What causes numbness in left arm at night?
Patient: Hi. I have a question about my arm. My left arm always goes numb during the night meaning I can t feel it and when I go to lift it in the air it s feels super super heavy and jus falls right back down n stays like that for awhile afte I wake up. What does that mean? And should I be worried? Doctor: Hello,  We need a physical examination and assessment of the upper limbs. As you mentioned about having weakness in the arm and unable to lift, I feel this should be related to the nerve impingement. As nerve has a function of motor and sensory any disturbance in the nerve functioning can lead to such symptom. As it is occurring only in the lying position I think this should be due to pressure falling over the nerve in the cervical region leading to dysfunction of the nerve and leading to symptoms.  Please do some neck stabilizing exercises for which you can find videos online about cervical spondylitis.  Most cases in my 12 years of experience have recovered well with simple exercises.  Hope I have answered your query. Let me know if I can assist you further.  Regards, Jay Indravadan Patel, Physical Therapist or Physiotherapist