If you are, to do one, I would advise, to make sure your not working, the day afterwards.
Did one years back.
I didn't have a great sleep, despite getting in 2 sessions before sleeping.
Another in the morning, then off to work, shortly afterwards.
I was, pure knackered that day.
Not sleeping, in my own bed, plus sleeping with, more or less a stranger.
This wasn't the best exercise, from my experience.
A four, or five hour booking, has been done, a few times, feeling a bit more refreshed, sleeping in my own bed.