When speaking about Lazarus, Christ used "sleeping" to symbolize death.

Each day our body tires, and we can no longer labor. Each night we review what happened that day and previous days and make inferences and connections. Each new day the sun rises like new life and new opportunity. We come out of a state of sleep and dreaming to rise and apply what we have learned and speculated about to reality.

All is as one day with God. What we do today is what matters.