During and after the COVID pandemic, I have worked from home much more often than before. I noticed that I sometimes get drowsy and mentally slow after only a few hours of work, which is slightly surprising in the morning after a good night’s sleep. It usually happens during scorching summer and freezing winter days when the windows of my tiny room are closed. I remember working in an old office when people complained about ventilation and asked for CO₂ sensors to be installed. I suspecte...
