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Sleep apnea is a common cause. You can't breathe, so your brain wakes you up to correct the problem.

Alcohol can be a cause. It depresses the brain and puts you to sleep, but when it wears off it has messed up your normal sleep cycle.

Urinary blockage can be a cause, especially in older men. They can't empty their bladders before going to bed, so they have to get up in the middle of the night.

General stress and anxiety can wake you up, too. You brain is thinking about stuff all night, so you wake up to worry about it some more.

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17y ago

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How do people wake up before their alarm goes off?

People can wake up before their alarm goes off due to their body's internal clock, or circadian rhythm, which regulates sleep and wake cycles. Factors such as stress, excitement, or anticipation can also cause individuals to wake up before their intended alarm time.


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A bitter taste in the back of your throat upon waking could be due to acid reflux during the night, sinus drainage, or poor oral hygiene. It may also be caused by certain medications or medical conditions. If this symptom persists, it would be advisable to consult a healthcare professional for further evaluation.


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The thalamus is one of the brain regions where neuronal activity increases when a person changes from one level of sleep to another during the night. The thalamus is involved in regulating sleep and wake transitions by relaying sensory information to the cortex.