There's a scientific reason as to why you want to nap all the time even after a good night's sleep
There's nothing quite like crawling under the duvet in the middle of the day, or plumping up a pillow on the sofa for a quick 20-minute nap.
For some, a nap is a daily necessity, to recharge your batteries and feel rejuvenated for the rest of the day. For others, it's a rare luxury afforded only after a bad night's sleep and ranks low down on the daily to-do list.
However, there might be a scientific explanation as to why some people need a power-sleep more than others.
A new study - published in the journalProceedings of the National Academy of Sciences- conducted on mice at the the University of Tsukuba in Japan, reveals that a single gene mutation may increase the amount of sleep a mouse needs. As a result, researchers believe this may provide better understanding about how humans sleep.
For this study, the authors built on previous research into the mutation of a protein called SIK3 and examined the effects it had on the sleeping habits of mice.
In addition to logging how long the mice slept for and how long they were awake for, the researchers studied the animals' brain activity during periods of dreaming and non-dreaming sleep, and levels of alertness during times when they were awake.
From their findings, they learned that by mutating the 551st amino acid in SIK3, the mice subsequently needed more sleep and slept for longer, something that was reflected in their brainwave activity.
The scientists also learned that the mice were also awake for less time than usual during the night, which is when they are normally most active.
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