Sleep
Altitude Acclimatization
Altitude acclimatization adapts the body to lower oxygen through gradual ascent and sleep strategy. Climb high, sleep low reduces acute mountain sickness risk.
Altitude acclimatization is the body's adaptation to lower oxygen at elevation—gradual ascent, sleep at moderate heights, and hydration reduce acute mountain sickness risk. “Climb high, sleep low” is the classic mountaineering rule.
Fitness helps but does not replace time at altitude.
Common questions
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How fast can you ascend safely?
Guidelines often cap sleeping altitude gains near 300–500 m per day above 2,500 m, with rest days. Individual tolerance varies—descend if symptoms worsen.
Related terms
Put Altitude Acclimatization into practice
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