Here's why you had a bad night sleep in your new room


Woke up this morning after sleeping in my Aunt's house for the first time, It was the worst night ever. 

Well scientist have found an answer to why your night was not so good. When you sleep in unfamiliar environment, only half your brain is getting a good night's rest, while the other is on guard.

Now you know why you had a bad night when you slept in your aunt's place right.

"The left side seems to be more awake than the right side," says Yuka Sasaki, an associate professor of cognitive, linguistic and psychological sciences at Brown University.

Sleep researchers discovered the "first-night effect" decades ago, when they began studying people in sleep labs. The first night in a lab, a person's sleep is usually so bad that researchers simply toss out any data they collect.

But Sasaki wanted to know what was going on in the brain during that first night. So she and a team of researchers studied the brain wave patterns of 35 Brown University students.

The team measured something called slow-wave activity, which appears during deep sleep. And they found that during a student's first night in the lab, slow wave activity was greater in certain areas of the right hemisphere than in the corresponding areas of the left hemisphere.

After the first night, though, the difference went away.

To confirm that the left side of the brain really was more alert, the team did two other experiments. First, they had the sleeping students listen to a repeated standard tone followed by a single tone of a different pitch.

When someone is awake or sleeping lightly, the brain responds to this "deviant tone." And the students' brains did respond — but only on the left side.

Then the researchers played a sound loud enough to wake someone who was sleeping lightly. And they found that students woke up faster when the sound was played into the right ear, which is connected to the left side of the brain.

The ability to rest just one side of the brain has never been demonstrated in people before, says Niels Rattenborg, leader of the avian sleep group at the Max Planck Institute for Ornithology in Seewiesen, Germany. But he says it's a trick many animals can do.

"When we're sleeping in a new environment and we don't know how many predators are around," he says, "it would make sense to keep half the brain more alert and more responsive to bumps in the night."

Sasaki says that brain response is involuntary and there's nothing people can do to prevent it, even if they've just flown in for an important meeting the next morning, and they need the best of sleep.

Stay Healthy, Stay Wise. 

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