No, please do not roll or shake the pen/vial of Levemir! It is a solution, not a suspension like prozinc.
Store Levemir in a part of the fridge away from the freezer so it doesn' accidently freeze and also do not store it in the door because the door is constantly being moved. If you have the pens, keep them closed and in their box. If you have the vial, keep it in the box as well, it is sensitive to light. All pens including the present "open" one should be refrigerated for longest life. Pay no attention to the manufacturer's 42 day limit, that does not apply since we keep it refrigerated. I used pens till gone for more than twice that long and others report using them well past their expiration date printed on the pens!