My vet does this same thing. I also questioned the sense of it because they are alone for part of the night - It has been about 20 years since I last had pets neutered and it was always a same day procedure. But - they explained that the hospital was open until 7pm, cleaning staff were there until 10pm and then techs come in at 6am, and that they felt the animals were safer while confined to a cage the first 24 hours to make sure they did not exert too much and to be sure they eliminated -- so I felt OK about it - though still would have prefered to just bring them home!

Take care DJ - I know you will worry no matter what! That is what Meowmies are for I think Tomorrow you can hug and smooch on Remus.