Wow! I love this topic today. Talking about the brain been sensible when we are in strange bed. I've had the experience severally. I go to camps a lot. But the only difference is that you said the 'brain assumes one will be OK after the first night'. Well, mine is different in that if am at home, it might take a longer time for you to wake me up. But once am camping or in a strange bed, I wake up at every slightest sound I hear until maybe after 4 or 5 days.....

Nice research friend... 👍