Från seat61s sida "Queen Mary 2, transatlantiska färjan ..." :
What's [a westbound] Atlantic crossing like?
The QM2's clocks are put back an hour at 2am on five of the seven nights because of the time difference, giving you a welcome extra hour's sleep in this direction
What's an eastbound Atlantic crossing like?
The QM2's clocks are put forward an hour at 2am on five of the seven eastbound nights because of the time difference, giving you an hour's less sleep in this direction - if there's one reason why a westbound crossing can be nicer than an eastbound one, this is it! (update 2013: Cunard has tried the crazy idea of putting the clocks forward at midday on recent crossings, much to passengers dismay, as it can be confusing and means dinner is too soon after lunch!)