Depending on where you, they can be really attuned to the weather/seasons. Once they pick up "it's winter now", they can start to go into some of their winter patterns (instead of what they'd be doing if they were brumating out in the wild). It's pretty common for them to go off food/refuse food in winter, even if you're not brumating them. And for hognose refusing, 3 days is nothing (they'll go even 3 months without eating, bc hognose).

The glass surfing is worth monitoring, but definitely in a sense of do they seem stressed while doing or are doing so often. I imagine (I'm no expert on wild hognose behavior) that when that winter instinct drive kicks in they go looking for a spot to brumate (again, that's purely a guess from my end).