Jesus fell to the ground to pray because of his deep distress (see Genesis 17:1–3; Leviticus 9:24; Numbers 14:5; 16:4). Since it was normal to pray out loud, Jesus was probably overheard by the three disciples, who would not have fallen asleep immediately.
Jesus addressed God as Abba, Father, indicating their close relationship (see Romans 8:15; Galatians 4:6).
Take this cup from me: In faith, Jesus expressed his own feelings and desires to the Father. It was not only the physical pain of crucifixion that terrified him, but also the unique death that he would experience. He "who knew no sin" would experience the wrath of God against sin (Mark 15:34; 2 Corinthians 5:21; Galatians 3:13).
Yet not what I will, but what You will: The submission of Jesus to the Father’s will is a model for his followers.