Condensation Inside TC!!?

Hi Guys, woke up this morning and the escape hatch over the bed was lined with little droplets all the way around it? At first I thought it had rained real hard but it was dry outside so realized it was obviously condensation from my heavy breathing.. The weather did change where I am right now last couple of days and got colder so I had all the windows and vents closed.. That could have caused it but not sure about the scale of droplets I had inside my rig... What say the quarum? Leave a window vented a bit???