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Are you sure you weren't actually asleep? I sometimes have what I can only describe as lucid sleep at altitude. I feel like I'm thinking about stuff but actually it's just super vivid and realistic mundane dreams...
Whenever I sleep a I've 3000m I tend to wake up a few times gasping for air during the night. I'm obviously not actually suffocating but somehow my brain decides that I am in its sleep state.
I've been sleeping at 2000m for three weeks and I still struggled to sleep at 2800m on Saturday night...not surprised you found it hard too!