Hi,
I was extremely sleepy before my treatment. In fact, I could not wake up on my own, somebody had to shake me from sleep. It was not unusual for me to sleep until 2 PM on the weekend until somebody finally stormed into the room, completely disgusted. I was also falling asleep at late night parties we went to; I have a lot of pictures to prove it. All of this was gone after surgery, although my party time was completely over because of headaches. I was explained that the reason for this sleepiness is the pressure on the brain by a huge tumor that I had. I don't know if that is really your case since your tumor is smaller and presumably there is no pressure on the brain but it seems An can give you anything! Best wishes to you; your tumor is not big, so there is an overwhelming chance you will come out of any tretment without any major complications.
Eve