What does the Bible say about falling asleep spiritually?

In the sermon, it is highlighted that throughout Scripture, there is a significant warning against falling asleep spiritually. For instance, Paul, in Acts 20:28, urges believers to take heed to themselves and their spiritual vigilance. The metaphor of spiritual sleep is illustrated with the parable of the ten virgins in Matthew 25, where half were foolish and unprepared, showing that all appeared similar but lacked the essential oil of readiness. Falling asleep spiritually can diminish our confidence and joy in salvation, yet it is assured that those truly belonging to the Lord cannot be lost. This stresses the necessity of constant vigilance against complacency in our faith.