Indeed, the laws in Sweden states that sex must be consensual, that unless an explicit state of consent exists, no such must be inferred.

Specifically, the criminial law, 6th chapter, 1st section defines "sexual contact with someone who is not in a state to consent" (e.g sleeping, unless such consent had been given earlier). The expected sentence is 2-6 years (unless there are extenuating circumstances, in which case the maximum term is 4 years).

Gosh, I really like having the law available on the web.