I just got into bed. I was reminded of something that either happened this morning or Thursday morning. I'm thinking it was Thursday... I woke up- pretty sure it was morning but anyway, I woke up, put my feet on the floor stood up and "walked" toward the doorway - only it wasn't really walking, it was more like stumbling sideways until I hit the door frame/wall. So I righted myself and the same thing happened during the 3 feet between my bedroom door and the bathroom door. I used the toilet and on the way back I was fine. What could this be?