When sleep escapes you, know that God is trying to speak with you. Open up His Word and listen to what He is telling you.
Jesus said that unless you believe who He is, you will die in your sins [you cannot get saved]. Jesus is the foundation of our faith which holds all other doctrines together. If you have the wrong Jesus, you will have the wrong doctrine.
Jesus prayed to the Father for the believers that their faith may not fail when confronted by the evil one [demons].