Chapter II sloka 69

ya inza svR-Utana< tSya< jagitR s<ymI,
ySya< jait -Utain sa inza pZytae mune>.

y ni sarvabhtn 
tasy jgarti sayamee |
yasy jgrati bhtni 
s ni payato mune ( 2|69)||

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 Muni (sage) who sees.