Nice photos, I actually just got back from Colorodo...visited Breck for 4 days.
I admit I did get elevation sickness the first night, couldn’t sleep, dehydrated, and got sick on the ski lifts the next morning (no joke I puked a couple times off the chairlifts).
Seemed like no matter what I did, or how much water I drank, Sleeping was difficult. I adjusted by the second day and was fine other than sleeping.
Next time I’ll try the oxygen like you had, I bet it would help. Thanks for posting.