On account of application for acquiring knowledge and of continued reflection and recapitulation, the Yogin remains always awake. Indeed, the Yogin can keep himself continually awake by giving himself up to knowledge.
ज्ञानाभ्यासाज्जागरणं जिज्ञासार्थमनन्तरम्। विज्ञानाभिनिवेशात्तु स जागर्त्यनिशं सदा॥