Increased risk of heart attack:
Covering your entire body, including your face, with a blanket prevents your body from getting enough oxygen. This directly affects your heart. Health experts say that this can increase your risk of a heart attack and shortness of breath. Sleeping with your face completely covered can also cause nausea and dizziness.
Affects blood circulation:
Sleeping completely covered by a blanket prevents sufficient oxygen from entering. This causes the oxygen already present in the body to be reused repeatedly. This gradually reduces the oxygen levels inside the blanket. This directly affects your blood circulation, preventing proper blood flow to every part of your body.