Not Enough Windows or Roof Vents

My 18' trailer has a huge front window, one on each end of the queen bed, one in the door, a huge window in the slide, one over the sink opposite the slide, and one for the bottom bunk. I would guess 20% of the outside area is glass. For us it's actually a problem as we're a family of late sleepers, we ended up making black out curtains for each window that didn't come with shades. We've also got two roof vents and we put a solar cushion in them most of the time. If we were to open everything up it would be as bright as a tent.