Dutiyasoceyyasutta 3.4

3.4

santaṃ vā ajjhattaṃ thinamiddhaṃ: ‘atthi me ajjhattaṃ thinamiddhan’ti pajānāti; asantaṃ vā ajjhattaṃ thinamiddhaṃ: ‘natthi me ajjhattaṃ thinamiddhan’ti pajānāti; yathā ca anuppannassa thinamiddhassa uppādo hoti, tañca pajānāti; yathā ca uppannassa thinamiddhassa pahānaṃ hoti, tañca pajānāti; yathā ca pahīnassa thinamiddhassa āyatiṃ anuppādo hoti, tañca pajānāti;

When they have dullness and drowsiness in them they understand ‘I have dullness and drowsiness in me’; and when they don’t have dullness and drowsiness in them they understand ‘I don’t have dullness and drowsiness in me’. They understand how dullness and drowsiness arise; how, when they’ve already arisen, they’re given up; and how, once they’re given up, they don’t arise again in the future.