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4. Insomnia

Effects of low oxygen on the brain can lead to insomnia. Wakefulness can be an advantage since sleeping at high altitudes before acclimating can allow symptoms of high altitude sickness to progress during sleep. In severe cases, this progression could lead to coma or death overnight as the brain enlarges and the lungs accumulate fluid, making it difficult to breathe.

other Symptoms of high-altitude sickness

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