Wed, 3 Feb 2010
                                                                    
                                                                      Answered on 
                                                                
                                                                    
                                                                    Wed, 3 Feb 2010
                                                                    
                                                                      Last reviewed on   
                                                                During sleep if you do in the wrong posture then it shall impair blood flow I believe and thus you shall feel numb. Or might be one of your nerves is being pressed and hence the area supplied by it gets affected.
                    
                                    
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