It's interesting to me that Jesus continually woke up early in the morning or prayed in the middle of the night. David did the same thing, saying in Psalm 5:3 "My voice shalt thou hear in the morning, O LORD; in the morning will I direct my prayer unto thee, and will look up." Do you value sleep more than spending time with the Lord? Do you struggle to drag yourself out of bed early enough to read your Bible? If you do, it's not a physical problem, it's a priority problem. Wait and see how hard it is to get up at 4:00am if you are going on a trip somewhere exciting (like six flags!). I guarantee you won't have any trouble with sleeping in. Ask God to give you the same excitement for His Word, and make it your number one priority.