Haha yeah it is. My friend woke up some girl sitting next to us on the train yesterday (coz her friend sitting a couple of seats away was calling her) and she jumped up, half-asleep, let out a squeal and started bolting to get off the train before she realised what was going on. Unfortunately for her we were all seated on those stupid "facing-the-whole-carriage" seats and everyone started laughing at her. They weren't mean or anything, so it turned out to be a nice, light-hearted moment for all lol.