Romans 13:11-12 — And that, knowing the time, that now it is high time to awake out of sleep: for now is our salvation nearer than when we believed.
The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armor of light.
sleep = spiritual lethargy
salvation — from present circumstances and from the coming wrath.
night — period of man's alienation from God. Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness. Therefore let us not sleep, as do others; but let us watch and be sober. For they that sleep sleep in the night; and they that be drunken are drunken in the night (1 Thessalonians 5:5-7).
Put on armor:
Ephesians 6:11-14 — Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armor of God, that ye may be able to withstand in the evil day, and having done all, to stand. Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness.
1 Thessalonians 5:8 — But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation.
Ephesians 5:14-17 — Wherefore He saith, Awake thou that sleepest, and arise from the dead, and Christ shall give thee light. See then that ye walk circumspectly, not as fools, but as wise, redeeming the time, because the days are evil. Wherefore be ye not unwise, but understanding what the will of the Lord is.