The battle is in the mind, and we are instructed to regulate thoughts. We are even told what to think about - Philippians 4:8.
If there is no prayer, there is no power to be alert to the thought life. There is no recognition of the gap between where the thoughts are and where they should be.
We are to take each thought captive and lead it away. If there is no prayer, there is no vision as to how to expel thoughts that do not line up with the whole of God's Word.
Without God's Word, there is no skill in prayer. We know the Holy Spirit , but He leads according to The Word. Little skill in the word results in little power in prayer.
While the enemy can attack physically, he far prefers to flood the believer's mind with things that cause irritation, worry, fear and guilt.
God's Word is more real than the way that you feel. Line up your thoughts with His.