You mentioned your room was cooler . . .
In the winter, I'll put bottled beer in my small utility room to help boost the temp and speed carbonation. I usually have the hall thermostat set at 68 F, but the rest of the house is actually about 66 F. When I'm using the electric clothes dryer, or the gas hot water heater fires up, I get an additional bit of heat. The vibration from the washer spin cycle probably helps a bit too.
I also like to cold crash all my beers. Too much traub tastes like dead yeast cells to me.