あお向けに寝ると、舌やノドチンコがノドの奥に下がるため、上気道が塞がりやすくなります。 If you sleep on your back it's easier for your upper airway to be obstructed because your tongue, uvula, etc. slip towards the back of your throat. 僕は少年のころよく草の上にあお向けに寝ころんで、白い雲を眺めたものだった。 As a boy I used to lie on my back and look at white clouds. 彼は気を失いあお向けに倒れた。 He fainted and fell on his back. 新聞によれば、少年はなぐられて意識を失い、目を閉じてあお向けに倒れていた。 According to the newspaper, the boy was knocked unconscious and lay on his back with his eyes closed. 私は通りで老人があお向けに倒れるのを見た。 I saw an old man fall on his back in the street.
