I learned this lesson even with early morning flights. One time, we thought it would be great to take the early flight to Orlando and arrive at about 9am and get almost a full day in the parks. For us, that was a big mistake. We were banking on a quick nap in the room at some point, but our room wasn't ready until after 6pm. We just dozed in the Wilderness Lodge alcove chairs waiting and waiting for the room to be ready because we were too tired to go the parks without a nap and thought the room would surely be ready by early afternoon. Nope. We probably would have gotten more park time that day if we had taken a later flight.