" Oh , yuck , and I just washed that ! " " I ai n't putting that other one back on . " Manji still looked drained and did n't sit up , but his voice was sharp . " I did n't say you should ! " Rin flushed and looked away . Her right hand felt as if it had fallen asleep . She flexed the fingers and shook it , then winced at an unpleasant buzz in her flesh and mused under her breath .

Question: What would cause someone 's hand to have Fallen asleep as Rin 's has ?
Answer: If the hand is tired it will want to go to sleep .It might need a nap .. so that will cause it .If Rin decides to put her hand do sleep she can just will it .None of the above choices .