“Wherefore he saith, Awake thou that sleepest, and arise from the dead, and Christ shall give thee light” Ephesians 5:14.
Spiritual sleep is a state where you live overshadowed by the worries, lusts and goals of this world and ignore the matters of your soul and the Word of God. It takes both conscious efforts on your part to take interest in the spiritual things as well as the help of the Holy Spirit for you to really awaken. When we notice that we lose interest in the things of God, we should really get worried. It is time to start praying and seeking the face of God regarding our spiritual states.
See also:7 Scary Bible Verses about Hell