I just finished a 7 day dexamethasone treatment and had a few questions about some of the side effects. In the past I've used prednisone, 60mg 10 days then 3 day taper, with great results but eventually it seemed to become less and less effective. Side effects for me were increased appetite(10% lb. increase) and euphoria. With dexamethasone I also had insomnia, to the point I was awake for 66 hours straight, until 4 1/2 hours of sleep last night. The headaches are gone for now but most times in the past they've come back 2-3 days after stopping this particular treatment. How common is this(the insomnia)?