Does your ventilator really make a noise, like from a motor? Sometimes when I have been stressed or very tired, my brain takes noises that don't mean anything and translates them into speech. As sweet slumber says, try to relax.

When you say it is 35 degrees, you mean celsius right? (That would be very hot, fahrenheit would be very cold.) If so, the heat may be affecting your thinking and your ability to sleep properly. Try to do what you can to stay cool.