Doctor reveals the exact time you should go to sleep if you want to wake up refreshed

A DOCTOR has revealed the exact time you should go to sleep if you want to wake up feeling refreshed.

Dr Karan Raj took to TikTok to explain that waking up feeling groggy in the mornings could be linked to waking yourself up in the middle of a sleep cycle.

In a video called 90-minute rule, which has racked up over 1.6million views, he said: "Try this if you want to wake up feeling refreshed.

"Every night your brain moves through several sleep cycles. Each cycle starts with light sleep, then you enter deep sleep, then dream, and back to light.

"Each of these cycles is around 90 minutes. You feel most refreshed if you wake up at the end of one of these 90-minute cycles.

"That's because you're closest to your normal waking state and to increase the chances of this, first figure out what time you want to wake up."

Dr Raj said people need to work out when they want to wake up, and then count backwards in 90-minute cycles until they find their optimum bedtime.

This means, if you want to wake up at 7am, then the ideal bedtime would be 11.30pm.

He added: "Won't work for every single person because of fluctuations in the length of our sleep cycles but it's a good rough target to aim for!"

We shared how you could be paid £1k just to SLEEP as mattress company seeks ‘nap reviewers’ – but the application closes soon.

We previously revealed how ditching your PJs and sleeping naked makes for a better night’s sleep

And a sleep expert reveals why our bodies jerk before we drift off – and it’s all down to sleep deprivation.

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