UPDATE: I'll be at the hospital for "23 hours" starting Friday morning.

Why 23 hours?

*shrug*

Apparently, there is a distinct difference between an "overnight stay" and a "23 hour stay" which happens to include a person being in the hospital overnight.

The difference?
Probably price and I'm hoping that 23 hours is cheaper than overnight...

I get to leave the hospital at around 9am on Saturday morning.

So, more changing as a result of finding that. Basically the doctor wanted one thing (the 23 hour stay) but the administrative staff booked another.
But all is well and I'm heading out to see the sunshine!