In the Old Testament, we read about the various prophets serving and attending to the Lord day and night. Psalm 1:2—Blessed is the man who meditates on the law of the LORD day and night. In the New Testament, we learned that the early disciples of Christ served the Lord and prayed to him day and night. So the question is "How often do we even think of the Lord during the day?" To force yourself to think about the Lord continuously when you don't feel like it would be both painful and meaningless. Let the Holy Spirit draw you into it and it becomes effortless and a joy. Again, it comes down to being open to the Lord to know him first. Attaining union with God will take care of all such spiritual problems.