喉ちんこ
1
uvula
See also:
口蓋垂 (こうがいすい)
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.