Maybe they were having a party when the time loops started.Really? Because a thirty minute timeloop does not account for the mad raves they appear to be having on the ship. Looks like something much more than a timeloop going on to me...
Or maybe it's like that one episode of SG1 when O'Neill and Teal'c are caught in the time loop and they decide to do shenanigans for a while because they know it will reset anyway.
Or maybe we should just wait for Sunday to find out.