The exact science behind preferred sleep temperature is pretty complicated. Generally, experts recommend that you sleep in a room set between 65 and 72-degrees Fahrenheit, but not everyone fits that mold. If your bedroom is too warm or too cool for comfort, you’ll have trouble not only staying asleep, but completing your REM cycle.
If you’re sleeping beside another person, it can be difficult to find a temperature that suits the two of you. This is where blankets come in! Add a comforter (or three) if you’re cold, and maybe just a sheet if 65-degrees is your TOC (temp of choice).
Okay, but if push comes shove, is it easier to sleep in a room that feels too cold, or too warm? Sleep-wise, cool is preferred to HOT. Again, everything in moderation. Teeth-chattering cold will probably keep you awake, and so will sweat-soaked sheets.