I haven’t read it so I’m out of your league there!
The only way it could be 'not wrong' would be if you could in all honesty say 'I didn't realize I was doing that.' For instance, if you thought the sleeping person were actually a mannikin and you were on a theatrical set and playing the part of a fictional murderer: you didn't know you were actually stabbing a man.
Incidentally, I think that ordinary, commonsense, secular law often gets this better than philosphers do. Any jury could plainly see this, and make their decision in 30 minutes. It's the philosophy dept. that would babble on about it for several years and never come to a verdict.