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10th January 2016
10:55pm GMT

But by going back to sleep, you confuse your brain and it doesn't know what time it should tell your body to wake up, meaning your body goes a bit haywire.
"It becomes kind of like jet lag," says Dr. Winter. "You wake up feeling kind of groggy, like you have a dull headache, maybe a bit of nausea, and lethargy—you just don’t feel like doing anything."
The best option is to resist that almost overwhelming urge to nod off for another while and get out of bed, no matter how much you hate it.