I've had a few overnights...ALL have been with wgs that I've met before and know that I got on with really well. It's unrealistic to expect that you will be shagging all night, and so yes, you will at times be paying for them to be sleeping.
I've never paid the 'advertised' going rates for overnights either....you need to negotiate a sensible rate, and that will only realistically happen with wgs that you get on with. Plus allow for any extras such as dinner, drinks, etc that you may be expected to pay for.
In reality, on a 10/12 hr overnight booking, at most you'll get about 4 hours of action on the evening, and maybe another couple in the morning....at most....so consider this when working out rates.....sometimes a good overnight booking will cost the same as 7/8 separate 1 hour punts....take that into account.
I've been lucky.....the overnights I've had were all with great girls. A couple were actually free of charge following on from an evening's punt where on one occasion, she asked to stay as we were pretty drunk and shagged out and she couldn't be arsed to go home. A hotel breakfast in bed for two followed by another hour or so of shagging and off she trotted on her way.
On another occasion, it was an incall to another wgs hotel room...had the punt...got chatting over wine afterwards....a couple of hours later she suggested I stay over, another shag in the evening, and woken by a blow job in the morning....nice!
Cheers,
Mij