#17: Sleep is Bloody Remarkable

If you bring that person into a strange location, an unfamiliar location, such as, for example, a sleep laboratory, or even if you take them into a hotel, then one half of the brain will not go down into as deep a sleep as the other half of the brain.

We have never seen unihemispheric sleep across any species when it comes to rapid-eye movement sleep, or dream sleep. It's only during non-rem sleep that we see the expression, the ability, to have one half of the brain asleep and the other half of the brain awake.