if you sleep on your chest with your hands by your head .

if you sleep on your chest with your hands by your head if you sleep on your back with your arems and legs out wide .

热心网友

if you sleep on your chest with your hands by your head如果你的睡姿是伏卧而双手放在头旁if you sleep on your back with your arems and legs out wide如果你的睡姿是仰卧而四肢摊开