I know I can setup a morning appontment and have, with a provider in advance .  Is it unethical to call at 7 am and try to get something going when I'm suddenly in the mood?

I am an early riser.
I've hosted in call at 5:45. And honestly prefer it.
Many men (and myself) are more aroused in the morning.

I masturbate in the morning more than any other time of day too.
.....
A question for the OP, where (location) do masturbate most often?

Myself.......? In the shower in the morning.

As is,
AF

But you will likely have a real hard time getting someone to answer the phone at that time.  You might contact some girls in whom you are interested ahead of time and find out if they take appointment requests at that time of the day so you know whom to try.

When I go to visit out of town, I often wonder where the horny people are at 5am. lol
To be sure I am not only rubbing one out that early...

Nothing better than a early bang to start your day right

maybe arrange an overnight appointment.  spoil her with dinner or find another way to enjoy the evening, hit the hay and have your fun in the AM before breakfast.  my $.02

1st thought "gotta be at work @7:30 ;  
2nd thought " wish someone here to fuck before that...
3rd thought " better get the puppy outdoors ASAP.