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Getting to bed at a certain time could help ensure a great night’s sleep.

In a TikTok video, Ontario-based naturopathic doctor Kara Petrunick (@doctorkara.nd) shared the “second wind” theory that occurs between the hours of 11 p.m. and 1 a.m.

“If you go to bed between 11 p.m. and 1 a.m., you are doing a disservice to your hormones,” she said.

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“In the evening, cortisol should be at its absolute lowest, because it needs to allow melatonin to be at its highest to put you in a deep, restorative sleep. Cortisol and melatonin work opposite each other.”

Staying up after 11 p.m. triggers an additional spike in cortisol, suppressing the release of melatonin, according to Petruni

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