What to do if the girl falls to sleep?

It happened to me at least 5-6 times....girl fell to sleep when
I needed a 2nd SOG or even before 1st SOG began. The duration
of sleep lasted from 15 min to more than 2 hours! One incident,
I gave her DATY and she came like a waterfall, vagina fluid
everywhere, she became so relaxed, she fell to sleep.

What do you do in such an instance?

STN: good idea to walk out....only one time did it happened at in incall. So, that's not an option. Although this did not happen very often (once every 2 years on average), I find myself too nice and just lose my time. Some girls find themselves too comfy with me cuddling and just fall to sleep.

DD41: Except for the incall incident, it was all agency and outcalls...I just let them wake up....they won't be in a good mood being woken up. Like I said, I am a nice guy and just absorbed my lost time. I normally don't call and complain. That'll just ruin the mood for the session. As for the 2-h incident, it was an incall. She made up for the 2-h when she woke up.

But, those are good ideas, guys....I find myself not wanting to be the nice guy any more.