It's simply a fact that many of us often wake up in the middle of the night and don't even know it. It's called unconscious wakefulness or "cortical arousal", and it refers to the moments during slumber when a noise or another stimulus disturbs our rest, causing our bodies to be momentarily alert out of stress or fear, even if we're still in a restful state.

https://www.eatthis.com/news-this-sleep-habit-doubles-the-risk-of-early-death-in-women-says-study/

A recent study implies that unconscious wakefulness is a sleep habit that may increase the risk of early death, and the study indicated that the risk is greater for women than for men ... Therefore, What are the causes of unconscious wakefulness? And how do we know that we've experienced it? And finally, what should be done about it?

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