Tim Childs has a solid article on Daniel as a man of prayer.
First, Daniel was not forgetful to pray. Daniel and his companions had been taken captive and had been taken away to a foreign land. Under his adverse circumstances, he refused to blame God. He would not shout or shake his fist at God. He would not give God the silent treatment and try to punish God in any way. Rather, he continued to recognize God as God. He continued to understand how precious and meaningful his relationship with God truly was. Therefore, three times daily he knelt upon his knees and prayed, giving thanks.
This is a good point about not reacting negatively to what happened to him; rather, he continued to trust God and seek his face.
Check out the whole article here.