How hard it always is to fall asleep with the anticipation ...I've always heard it was difficult for a fellah at "attention" to fall asleep...:-)

The only thing I would add to the great advice above, is be sure to use protection; have some condoms available in case he doesn't. It would be a good idea to also have some lubricant and/or spermicidal jelly handy. It's a sad fact these days that we have to be careful, but it can be handled in a senstive and/or fun way.