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Turns Out Your Brain Does Sleep ‘With One Eye Open’ Sometimes

It turns out when someone says there going to sleep 'with one eye open' they’re not exactly lying.  (Image:  Unsplash via   pixabay /  CC0 1.0)
It turns out when someone says there going to sleep 'with one eye open' they’re not exactly lying. (Image: Unsplash via pixabay / CC0 1.0)

Have you ever wondered why you can’t sleep in a new place and you prefer to sleep in your own bed? Science now has the answer. As it turns out, when someone says they’re going to sleep “with one eye open” they’re not exactly lying.

A phenomenon, what scientists call the “first-night effect” (FNE) has now been studied. It happens when a person stays in a new place that’s unfamiliar to them, like a motel room. The brain goes into survival mode, with it only turning half off, resulting in one hemisphere remaining more “awake” than the other, in a state of readiness for trouble.

Scientists from Brown University who made the discovery have also suggested that it may help us to jump awake when a strange sounds approaches. Even though FNE has been known for some time now, it has never been fully understood why it happens — until now.

Sleep scientist Masako Tamaki and her colleagues used advanced neuroimaging techniques to carefully analyze 35 volunteers and their brains while they slept. Yuka Sasaki of Brown University and lead author, said in a statement:

The study found that a particular network in the left hemisphere remained more active than in the right hemisphere. When an irregular beeping sound was played in the right ear to stimulate the left hemisphere, it increased likelihood of waking, and faster action upon waking. However, when the sounds were played in the left ear to stimulate the right hemisphere it had little effect.

But, in subsequent sleep sessions it was found that both halves of the brain turned off completely. Sasaki suggests that you may be able to reduce this effect by bringing your own pillow or even if you stay in hotels that have similar accommodations. She also says that it may even be possible to learn to turn this night surveillance off.

The researchers are now using transcranial magnetic stimulation to temporarily knock out the “awake” part of the brain to see whether sleep improves. For those who are interested their findings were published in the journal, Current Biology.

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