So my friends and I will be in Vegas in June and I'll be arriving 1 night before most of them.  A friend is staying in another room so I'll have my room to myself.  Do I schedule an appt for that night or early morning before they arrive?  If I schedule at night, what would be a good excuse to get away for the night from my friend?  Never had a morning session before so wondering if that's any different than a night session.  

You can do your own search of petite providers.  I really can't help you there, but I would recommend pre-screening with several ladies in advance of your arrival.  If you have P411, it is easy to get screened.

I know Jaydalee offers early morning dates as I have enjoyed several with her. And you can't do better than Sweet May for a petite girl...at only 4'10" tall and 85 lbs they don't come more petite than that. Both are wonderful girls.

Sweet May is as petite as you can get and very professional. No drama, no nonsense, on time and very sexy. Jaydalee is another great choice and fits the above description but she's 5' 7" (legs and ass that I still dream of). I had co-workers to deal with when I was in town, so I really appreciated that they were both discrete and on time. The only thing is you may need to put a pillow over their mouths when they get excited!

I would recommend you use 100proof agency. For your specific wants, Trinity fits the bill perfectly!  
Never had a 100proof girl be anything but on time.

I highly recommend gina sky.   I've seen her several times and she is my go to girl  in Vegas.  she is  gorgeous, a sweet person,  dependable,  and tons of fun.   she has  great reviews on ter.   check her out!

am a petite & very punctual provider who is actually based in L.A., yet I come to Las Vegas a lot since it's so close.  I usually request that my dates in Vegas be at least two hours, but if the date happens to fall on a day when I am already in town, I am totally okay with a shorter date if it's what you prefer