My surger pre-op is tomorrow and I had a call from the hospital today to get some information. During the call I was told that the doctor has requested a room for me to stay overnight. Of couse she didn't know why. I will see the dr for pre-op instructions tomorrow afternoon but I'm worried about why he'd arrange for me to stay overnight for outpatient surgery. I am diabetic and on insulin....could that be why? Anyone else have to stay overnight and why?