Eli5: Why do many people struggle to sleep on the first night in a different bed or environment?
In: 6
When people sleep in an unfamiliar place, only half the brain sleeps. Usually it’s the right side of the brain, for some reason. As far as we know, this usually only happens the first night. It’s also been observed in people under stress.
Until recently, we thought only animals could do this. for example, We knew that whales did this, which allowed them to rise to the surface to breathe while sleeping. they even keep one eye open to watch for predators while sleeping.
[https://www.scientificamerican.com/article/sleeping-with-half-a-brain/](https://www.scientificamerican.com/article/sleeping-with-half-a-brain/)
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