I would begin every morning with the greeting ritual and have them practice eye-contact. You can also have them pass an object every morning. Because they are 4 year olds I would also practice the self-control chant. Along with this, a quick freeze dance activity so that student have the opportunity to move and get the wiggles out in order to start the day. My students are a little older but, I have had them do freeze dance in the morning or a meditating ritual in the morning and that has really helped them to calm down and get ready for classwork.