1 Thessalonians 5:4-7

4But ye, brethren, are not in darkness, that that day should overtake you as a thief:

5for ye are all sons of light, and sons of the day: we are not of the night, nor of darkness;

6so then let us not sleep, as do the rest, but let us watch and be sober.

7For they that sleep sleep in the night; and they that be drunken are drunken in the night.