That's the hardest thing for me about evening riding. My HR is usually right about 150 as I'm riding and I need to be sucking down some O2 to keep going. Breathing through your nose just doesn't cut it for me.

I take the bugs as an impromptu protein snack

It's funny, if it wasn't for my bad shin splints, I can run for a REALLY long time once my breathing gets in stride with my running. Biking is different. Gotta learn how to breath better