Altimate™ High Altitude Sleep Mask

Sleep better.
Venture Higher.

At altitude, sleep disruption affects every adventurer, and every adventure. It strikes even the fittest, hardiest and most experienced among us and can diminish the enjoyment of the expedition.

The Altimate™ Sleep Mask helps regulate your natural breathing pattern that is often compromised or restricted at high altitudes, where oxygen is thin.

Poor sleep may worsen
high-altitude sickness symptoms

Though there is opposing evidence on a link between periodic breathing and AMS, symptoms are often worse in the morning due to decreases in oxygen saturation levels during sleep1. Drops in oxygen levels caused by periodic breathing may further put you at risk of experiencing symptoms.

Poor sleep at altitude can easily be attributed to a great number of factors from travel anxiety or excitement to sleeping in a different bed, or a new environment in general. However many people do not realize that troubled sleep may be caused by altitude-induced periodic breathing, which is a disruption of the typical breathing pattern.

Based on a recent pilot study, use of the Altimate™ high-altitude sleep mask was shown to improve periodic breathing and reduce high altitude headache, the most common symptom of AMS3.

Poor sleep is common at high altitude2

Poor Sleep Chart

1Burgess KR, Johnson P, Edwards N, et al. Acute mounain sickness is associated with sleep desaturation at high altitude. Respirology 2004;9:485-92.
2Sanchez O and Attarian HP. Central Sleep Apnea Due to High-Altitude Periodic Breathing. Medlink 1999.
3Patrician A, et al. (2019). The Effect of an Expiratory Resistance Mask with Dead Space on Sleep, Acute Mountain Sickness, Cognition, and Ventilatory Acclimatization in Normobaric Hypoxia. High Alt Med Biol EPub ahead of print.

What is altitude-induced periodic breathing?

Periodic Breathing Chart
  • Periodic breathing involves alternating between phases of hyperventilation followed by phases of intermittent, shallow breathing.

  • The shallow phases of breathing can include periods where breathing pauses entirely and you wake up gasping for air or signal your brain to increase ventilation and repeat the cycle with hyperventilation to improve oxygenation.

  • All of this atypical breathing leads to disruptions in sleep, which in turn increases fatigue and may diminish enjoyment of your activity over time.

Why does periodic breathing happen at high altitudes?

Periodic breathing at night Periodic breathing at night

4Ainslie P. N., Lucas S. J., Burgess K. R. (2013). Breathing and sleep at high altitude. Respir. Physiol. Neurobiol. 188 233-256.

  • Carbon Dioxide Symbol

    Contrary to popular belief, the drive to breathe is mainly influenced by levels of carbon dioxide (CO2) in the blood and not the need for oxygen4.

  • Oxygen Symbol

    At high altitude, however, your body senses lower oxygen (O2) levels in the blood and causes you to hyperventilate in an attempt to increase oxygen saturation levels. Though hyperventilation is an important aspect of acclimatizing, this drastically reduces CO2 levels.

  • Three Zs

    During sleep, this drop in CO2 levels can reach a threshold and turn off your body's drive to breathe until it further senses a drop in oxygen levels, signaling your body to breathe again.

What is acute mountain sickness (AMS)?

AMS symptoms include headache, fatigue/weakness, loss of appetite/nausea, and dizziness/lightheadedness; it is a common problem and high altitude.

5Netzer, N, MD et al. Hypoxia-related altitude illnesses. Journal of Travel Medicine. 20(4): 247-

High Altitude Headache Chart High Altitude Headache Chart

What Are the Effects of Dry, Cold Climates?

As you venture into mountainous regions, the density and temperature of air decrease and in turn minimize the humidity, or the amount of moisture that air can hold. Breathing dry, cold air may cause any of the following effects:

  • 1Thompson, R. (2007, June). High Altitude Cough. Retrieved from
  • 2Hultgren, H. (1997). High Altitude Medicine. San Francisco, California: Hultgren Publications.
  • 3Altundag A, Salihoglu M, Cayonu M, Cingi C, Tekeli H, Hummel T. (2014). The effect of high altitude on olfactory functions. European Archives of Oto-Rhino-Laryngology. 271(3). 615-618.
  • Dry Cough
    Dry, debilitating cough1
  • Sore Throat
    Sore and dry throat2
  • Nasal Congestion
    Nasal congestion3

Regulate breathing patterns at rest, naturally