In the same way that you would set an alarm clock to wake up and prepare yourself for a day, Paul is telling the church that it’s time to get out of bed. If you don’t have anything to do the next day and have no plans, why would you be concerned about getting up?
If it’s still the middle of the night and you cannot do anything until it is light, why would you not stay asleep?
In these verses there is a comparison between night and day, darkness, and light, evil and good.
Normally sleep is an essential rhythm of life that restores us, and it is biologically timed to happen after the sun sets. But that’s not the sleep Paul refers to. He is talking about a sleepiness that comes to the Christ follower when they get drunk, become sexually promiscuous and adapt to the prevailing culture of darkness in the world.
Do you ever have an anxious, foggy, and absurd way of thinking during some challenge you face in a dream at night? When you waken, you recognize that it was a dream and that you were not in a waking state of mind. The world lulls us into a sleep slate where we do not process with the clarity of a sober mind.
As you think about the darkness in the world today, you may feel that there’s nothing you can do about it, so sleep the night away. Paul is saying the opposite, though. He is saying in his time that Jesus’ return is close and it’s time to wake up and get ready for the new day that is coming.
Are you more concerned about how dark the world is, or about waking in anticipation for the coming of His light? Your salvation is getting even closer than when you first believed.
The dark night of evil is nearly over. The day of Christ’s return is nearly here. So let us get rid of the works of darkness that harm us. Let us do the works of light that protect us. 
Do you wake up with dread for the day ahead or do you awaken in hope and anticipation? Dread will cause you to keep hitting the snooze button, but hope will wake you up earlier than the alarm and ready to go.
 Romans 13:12