I find that if I keep the vents closed on for long enough, then I start to feel somewhat sleepy and don’t notice it. This is a bad thing to happen while driving.
I suspect that it may be caused by consuming oxygen faster than the imperfectly sealed vents are letting more oxygen in; the symptoms vanish quickly if I restore access to external air, either by opening the vents or opening the window.
I find that if I keep the vents closed on for long enough, then I start to feel somewhat sleepy and don’t notice it. This is a bad thing to happen while driving.
I suspect that it may be caused by consuming oxygen faster than the imperfectly sealed vents are letting more oxygen in; the symptoms vanish quickly if I restore access to external air, either by opening the vents or opening the window.
Interesting. I’m going to try to look out for that from here on.