from a woman's point of view spoonio is right that's rape how can someone(doesnt necessarily mean women only but guys as well) agree when they are asleep,drunk or under the influence cant say yes
so if the other person doesnt respond because they are asleep,drunk or on sleeping pills is ok I think not, with out a verbal yes and a no answer is not consentual it's rape
to those saying its rape, it is not if its consentual. Prior to the man/woman going to sleep they can say that they want you to play with them while they are not conscious. Sleep-play is a very real thing and is not rape if consentual.
even if its consensual as some keep calling it, in a court of law it is Rape either way you look at it, the person who would take advantage of a person not coherent is a rapist and should therefore suffer the consequences, that's all I am saying on this matter!