不眠ふみん Common Noun Noun English jmdict 1 noun (common) (futsuumeishi)nouns which may take the genitive case particle 'no' sleeplessness;insomnia;wakefulness 過労やら不眠やらで、彼はとうとう病気になってしまった。 What with fatigue and lack of sleep, he has fallen ill at last.