A person incapacitated by drug, disease, alcohol, etc lie with the upper poion of body lower than rest of the body causes

Postural asphyxia The condition where a person incapacitated by drug, diseases or alcohol, etc lie with the upper poion of the body lower than rest of the body pas. The common example is a drunk who slides out of bed so that his head and adjoining areas hang down from edge and the remaining body is resting at a upper level. Ref: TEXTBOOK OF FORENSIC MEDICINE AND TOXICOLOGY KRISHNAN VIJ FIFTH EDITION PAGE 119