Lol it's not "too" bad. My wife and I are small people and can pretty much curl up in a fetal position on the flat part of the seat. Only trouble is can't fully stretch out the legs, even with support on the floor, knees are still slightly bent. Occasionally I will wake up with quite a bit of knee pain which is a bad way to start the day. I think it aggravates the sciatic nerve which cases the knee pain.
We still do it 70-90 nights a year, but a good 4x4 van (like a E250 body dropped on a F250 4x4 drivetrain with a bit of a lift is our dream lol