I'll try and remember that time. In my dream I was in school doing a math problem but then I some how realized that I couldn't be in school so I snapped and said "This is a dream OMG!". I waved my hands around to erase the situation so I could make a new one putting me in control. When I finally generated my house it took all of my mental focus to keep the house and doing so made me lose focus on lucidity because I was too focused on thinking of a house.