盗ぬす人びとの昼ひる寝ね

expression

there's a reason behind every action

Proverb meaning that even seemingly odd or lazy behavior has a hidden purpose. Literally: 'a burglar's midday nap (is taken so that he can rob people's houses at night)'.

• 彼かれが急きゅうに勉べん強きょうを始はじめたのは、盗ぬす人びとの昼ひる寝ねというやつで、きっと何なにか企たくらんでいるに違ちがいない。

  The fact that he suddenly started studying must be a case of 'a burglar's midday nap'—he's definitely up to something.