You've got to sleep on the floor, that's what humans EVOLVED to do. At the same time, get rid of that air conditioning. Humans EVOLVED to live in Africa in the heat. THERE'S A REASON that AFRICANS are so much faster than americans and it's that they are living where humans EVOLVED.
Why do you think decathletes are the fittest people on earth? BECAUSE THEY ARE DOING WHAT WE EVOLVED TO DO! You got up in the morning, sprinted after the antelope, jumped over the river to catch him, hit him with a rock, jumped up into a tree to eat him and then sprinted all the way back to your cave! The next day you got up jumped over bushes, threw a different kind of rock, used a stick to help you get up on your elephant, and then hunted lions with your spear, and then ran home (this time farther because you had gone so far with your elephant).