Freezing...

My heater broke on the weekend, and it looks like the cool temperature froze my brain as well |o|. As such I didn't get much done except doing some clean up.
Seriously though it makes me realize an "acceptable" working environment is important to program efficiently. I was thinking of the world "comfortable" instead of "acceptable" but I realize "comfortable" could mean a place where you can just get sleepy as well. I wonder...could a comfortable place makes one sleepy or staying sharp depending on the desire of the individual, or are there 2 types of comfortable places, one that makes you sleepy, and the other makes you stay sharp?