Going to bed angry will cause you to feel bad when you wake up again. At the end of your day, look back. See if there is anything that you are angry about. Talking to God about the problem can help turn bad feelings into good ones. It is important that you do not keep anger in your heart.
God can give us His peace and His joy. He can help us see the truth about the problem. We are special to Him. He can guard our hearts from wrong feelings. Talking with our family and friends about our angry feelings can help. God will use them to bring peace and joy back into our heart.