Hang in there... morning will come soon.
I had a vet try that with me once when my little shih tzu was neutered. They said he was staying, and I said he wasn't.
I gave a time that I would be there to get him and they said "If the doctor says he can leave then..." and I replied that he will be leaving with me.
They had no one there at night either, and I told them that I would be caring for him during the night. I also explained that I am a nurse, so basic care of any living creature must be the same to a certain extent!
The women in the office were very rude and huffy when I arrived to pick him up that afternoon. They didn't think I should be taking him home, so I simply asked the one with the worst attitude, "Will you stay here tonight and make sure he's ok?" She was terribly flustered and shoved him into my arms, saying, "Don't drop him!" and turned heel and walked out.
We left, with a promise to not go there again... and we didn't, and he is fine. So having him home didn't damage him in any way, shape or form....
Kiss your baby in the AM and love on her ALL day!