Bhagavad Gita 2.69

या निशा सर्वभूतानां तस्यां जागर्ति संयमी।यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः ॥२.६९॥

yā niśā sarvabhūtānāṃ tasyāṃ jāgarti saṃyamīyasyāṃ jāgrati bhūtāni sā niśā paśyato muneḥ

That which is night to all beings, in that the self-controlled man is awake; when all beings are awake, that is night for the sage who sees.

गीता