Since last two night, when i get up in night for going to washroom i am feeling very weak. Like no strength is there in body. And very wired feeling. Can do daily household and office work easily but while sleeping this thing is happening. Actually i have been very anxious about my health specially heart health. So this thing is again making me worried. For your reference i want to state that i have doje heart check up many times and all time it has came okay. Last time it was done in may this year. Dont know whether this issue is related to heart or something else. Please guide me. What is this. Thank you B12 and vitamin d were low in last body checkup.