I Love Air Conditioning???

So last night when we went to bed our thermostat said it was 82 degrees in our house. Hot, but not unbearable. I figured since all the windows were open the temperature would go down. Yeah, No. I woke up a couple hours later hotter than heck. When I checked the thermostat it read 86 degrees. What the heck? Isnt it suppose to be cooler at night, so why the heck is the temperature going up. So, you'll never guess what I did? Thats right, air conditioner baby. Now, dont get me wrong. I hate turning it on, I hate that every summer I have to cut off my right arm to pay the bill, but oh the sweet bliss of sleeping without sweating to death!!!