Tweetwe live on top (3rd floor) of our building and don't turn heat on in winter..,.in fact we have a fan year round and most of year except a few weeks the windows are cracked if the ac isn't on...,i have to sleep naked and a little chilly if blanket isn't over my shoulder...once it is over my shoulder i'll wake up soaked within a half hour...it sucks waking up half dozen times each night ...,caffienated all day and little REM at night unless i've pulled an all night bender and next day finally sleep i can sleep several hours without waking up then