"but doesn't bother to compare that with the psychological benefit we get from hanging out with friends in daylight after work in the summer, or the psychologic

"but doesn't bother to compare that with the psychological benefit we get from hanging out with friends in daylight after work in the summer, or the psychological benefit of it not being dark when you go home and have dinner with your family." We have lights. We use them on warm autumn days with friends and family and when folks are sitting around outside playing cards late into the evening. I'm not convinced daylight is needed to enjoy time with friends and family. Sure, you might enjoy it, but it isn't exactly a deal-breaker. And no, I don't get that "not being dark when I go home". I'm in Noway, and if you work first shift - or heck, even business hours - you'll only see sun in December on your lunch break. Again, though, we have lights, and they are a pretty wonderful thing. Outdoor heating and blankets extend outside time too. Not just that, but folks with a later rhythm are going to suffer more. I'm going to guess especially teenagers (in general) will suffer, as doctors already complain that school is too early: Permanent summer time pushes it an hour earlier.