Wikipedia should resolve your confusion: http://en.wikipedia.org/wiki/Half-Life_2:_Lost_CoastI've never heard of lost coast
Indeed. It was intended as a tech-demo I believe, back when it was released.Lost Coast isn't even canon, it's just an extra level Valve decided not to put in Half Life 2. The only reason why he could would be some kind of dream sequence, but even then, highly unlikely.
That would be a perfect time to do it... Though not with the sleep part.Maybe after they use the teleporter at Nova Prospekt Gordon wakes up on the beach there, and after completing the stuff there, he falls asleep and then wakes up in Dr. Kleiner's Lab?