It's interesting that Jesus' concept of being renewed in strength and refreshed was not sleeping in, but getting out early before anyone else was up and communing with the Father.
Jesus drew His strength from prayer. I do not know of any greater evidence of the necessity of our praying than the fact that Jesus prayed. Jesus, being the Son of God, saw the necessity of prayer, how much more do we need prayer?
Look at Paul's strong exhortation to us to pray found in Philippians 4:6-7.
"Be anxious for nothing, but in everything by prayer and supplication, with thanksgiving, let your requests be made known to God; 7 and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus." NKJV
Let’s follow the example given us day by day by seeking the Lord through prayer.