sun does something weird to my skin every single year

Right so every summer without fail I forget that my skin just... changes. Like not badly necessarily, but it stops behaving the way it does the rest of the year and I'm always a bit caught off guard by it. Basically I run warmer, I sweat more, and suddenly my usual moisturiser feels like I'm putting cling film on my face. Had to swap to something much lighter this week and honestly should've done it weeks ago. The one thing I do keep consistent regardless of season is collagen — I've been taking it for long enough now that skipping it feels off, and tbh my skin just seems to hold up better when I'm consistent with it. That's not me saying it's magic, it's just... it works for me. Mind you I'm still absolutely terrible at SPF. I know. I *know*. Pharmacist brain says one thing, tired Laura at 7am says another.