腹の皮が突っ張れば目の皮がたるむ
1
one becomes sleepy when one's stomach is full;full stomach, sleepy head;when the skin of the belly is extended, the skin of the eyes droops
Other forms
腹の皮が突っ張れば目の皮が弛む 【はらのかわがつっぱればめのかわがたるむ】