Travel Tips
Better Sleep at High Altitude Nepal
Sleep quality drops significantly above 3,500 metres due to Cheyne-Stokes breathing and hypoxia. Practical strategies help you rest better and acclimatise faster.
Overview
Cheyne-Stokes breathing is the main disruptor of sleep at altitude — a cyclical pattern of deepening breaths followed by a pause in breathing (apnoea) that wakes sleepers repeatedly through the night. It is caused by the brain's imprecise calibration of the breathing reflex under hypoxic conditions and is almost universal above 3,500 metres.
Acetazolamide (Diamox) at 125 mg taken at bedtime significantly reduces Cheyne-Stokes episodes by stimulating steadier breathing. This is one of its most practically useful applications for trekkers struggling with disrupted sleep. The trade-off is increased urination during the night, but most trekkers prefer the interruption of a toilet trip over the anxiety of repeated apnoea episodes.
Sleep position also matters. Side sleeping reduces apnoea episodes compared to sleeping on your back. Elevating the head by 15-20 degrees (use your pack or extra blankets under the mattress) further reduces the severity. Avoid sleeping on your back entirely above 4,000 metres if possible.
Teahouse sleeping conditions above 3,500 metres are cold. Wear a clean base layer to sleep in plus wool socks. Use your sleeping bag's rated temperature capacity — a bag rated to minus five degrees Celsius is appropriate for most standard routes above 4,000 metres. Draughts through thin teahouse walls mean the inside temperature is often colder than anticipated.
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Avoid sleeping tablets and alcohol at altitude — both suppress breathing drive and can worsen hypoxia during sleep, increasing AMS risk.
FAQ
Q: Is it normal to wake frequently at altitude?
A: Completely normal above 3,500 metres. Frequent waking from Cheyne-Stokes breathing is experienced by most trekkers. The quality of rest improves as acclimatisation progresses over several days.
Q: Will I sleep better at lower elevations on rest days?
A: Yes significantly. This is part of the rationale for the "climb high, sleep low" strategy — sleeping lower preserves sleep quality during the acclimatisation window.
