“Studies have found that in general, the optimal temperature for sleep is quite cool, around 60 to 68 degrees Fahrenheit. For some, temperatures that fall too far below or above this range can lead to restlessness.” - Anthony Citrano from Bookmarklet

Finally a study I believe! If I don't sleep in a cold room, I can't sleep. - Shevonne

Makes sense to me. It gets warm enough some evenings to where I have a hell of a time getting a good sleep in. - Jonathan Hardesty

60-68 seems REALLY low though. Dang, I thought setting the a/c to 77/78 was low enough already. - ronin

If it's too hot for me I have nightmares. - Anna Lynn M.

@ronin No way. 68 for me. - Shevonne

I can believe this. I much prefer a cool room, whatever the season. - John (bird whisperer)

Definitely have to have a cool room to sleep properly. Few things worse than waking up in the middle of the night sweating (and no, not in a good way...) - FFing Enigma

I don't want to be baking hot, but I can't sleep if I'm too cold. I get cold easily, and then my hands and feet go dead and white. - Kamilah Reed (K. Gill)

I was just talking about this to a friend who asked me to split the cost of a hotel room. I had to explain how I always keep the room cool, while bundled under the blankets. - Anika

Side benefit of sleeping in a cold room: Wife is much much much cuddlier. - Wirehead

For those who, as I did, wondered how cold you feel at 60-68° F : its's a temeprature between 16° Celsius and 20° Celsius. - Zackatoustra

Yes! I love sleeping at about 65/66 degrees. Like LLL, I like to use the big comforter. I feel more comfortable and relaxed if I can breathe the cooler air. - Katy S

Sent this story to my wife, who likes it a bit warmer for the kids. - Hutch Carpenter

I thought it was just me. My sleep is much worse at 76-80+ temperatures. Normally I like 72-73 indoors, so 60-68 seems cool. Maybe it is better for sleep. :-) - Mitchell Tsai

Hmmm,I normally keep my house around 68 but then I'm British and used to cold old drafty houses - Sally Church

i think there is also cultural preferences/biases. when we lived in the UK we were amazed at how almost everyone turned their heat off completely at nite, thru-out the winter. when we came back, we began sleeping cooler, and love it. - Thom Kennon

Good point Thom, I find American houses far too warm and stuffy in the winter. - Sally Church

Sally, I'm with you: 68 is good, but 65 in the winter is AOK for me as well. I can wear socks and a snuggly shirt for less than I can heat the house to 70. - FFing Enigma

So there is a reason I use my ceiling fan at full speed at night. Interesting. - Ryan Massie

Ryan - indeed. love a good sleepybreeze. although your comment reminds me of how many hotel rooms and other rooms I go into where the ceiling fans are set incorrectly... I used to work in a lighting store so I notice such things. ;) [it's supposed to blow DOWN during the summer and UP during the winter] - Anthony Citrano

I'm always frustrated by the fact that hotel rooms do not have ceiling fans. I have trouble sleeping without the breeze. - Dennis O'Neil

I seem to be at the 68 degree end of the range, while my wife seems to be closer to the 60 degree end of the range for our optimal sleeping temperatures. :) - Hiding in Two Corners

I knew it! - Shey

LOL, silly Scott! In summer, the thermostat goes to 74 at night. In winter, I usually set it for about 67 during the day and 65-66 at night. Bundling up in blankets and comforter FTW! - Alleluiabug Heather

i believe it. - Carolyn Chan

i thought it was the opposite. - Kamamiya