I can't comment on Midazolam, but it has a VERY short half life - similar to Triazolam (Halcion).
This latter one is more like a 'whack on the head' than fun at all (very strong antegrade amnesia. Reports sugest that this is the same for Midazolam, hence its widespread use as an injectable pre-surgery drug.
However, Rohypnol is very nice!!
I'm quite certain Midazolam is indeed available for oral use in Europe as a sleeping pill, not just for hospital IM/IV use.