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Sleep at altitude. Train at full intensity.

The Live High, Train Low approach separates the altitude stimulus from the training session. You sleep at simulated altitude in your own bedroom, and train closer to sea level so your key sessions keep their pace and power.

Individual responses vary according to exposure, training status, recovery, health and iron availability.

See the systems
Sleep Cloud altitude tent set up over a made bed in a carpeted bedroom, with a mountain view through the window

Three ways to sleep and train at altitude

A tent over your existing bed, a whole bedroom converted, or an enclosure for indoor training. All three run on the same generator, sensor and app.

Bare white bedroom with a low grey bed beside a corner window overlooking a snow-covered mountain range
Box Altitude app showing target altitude 2,500 m, current 350 m, room 19°C and 60% humidity
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with an embossed logo and a perforated vent on one side
Sunlit bedroom with a low timber platform bed and floor-to-ceiling windows over wooded hills
Bare white bedroom with a low grey bed beside a corner window overlooking a snow-covered mountain range
Box Altitude app showing target altitude 2,500 m, current 350 m, room 19°C and 60% humidity
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with an embossed logo and a perforated vent on one side
Sunlit bedroom with a low timber platform bed and floor-to-ceiling windows over wooded hills

Altitude Bedroom System

Sleep Cloud altitude tent set up over a made bed in a carpeted bedroom, with a mountain view through the window
The tent seen from the corner with its clear zip door closed, green wooded hills through the window
The Box Altitude app on a phone, showing a simulated altitude of 2,059 m and 16.0% oxygen
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with an embossed logo and a fine perforated vent on one side
Sleep Cloud altitude tent set up over a made bed in a carpeted bedroom, with a mountain view through the window
The tent seen from the corner with its clear zip door closed, green wooded hills through the window
The Box Altitude app on a phone, showing a simulated altitude of 2,059 m and 16.0% oxygen
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with an embossed logo and a fine perforated vent on one side

Sleep Cloud Altitude System

Cyclist in an aero tuck on a time-trial bike and Tacx trainer inside the clear-walled enclosure, sea view behind
Runner mid-stride on a Matrix treadmill inside the four-poster enclosure, set up on a seaside timber deck
Interior view of a runner on the treadmill, tablet clamped to a stand, white canopy walls either side
Enclosure closed up as a plain white wall, with a person's silhouette showing through the fabric
Box Altitude App: target 2,500 m, current altitude 350 m, 19°C, 60% humidity, 7 hr 51 min at altitude today
Empty enclosure shown end-on against white, clear walls over a slim dark frame with a lead running out
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with a perforated vent panel and embossed logo
Cyclist in an aero tuck on a time-trial bike and Tacx trainer inside the clear-walled enclosure, sea view behind
Runner mid-stride on a Matrix treadmill inside the four-poster enclosure, set up on a seaside timber deck
Interior view of a runner on the treadmill, tablet clamped to a stand, white canopy walls either side
Enclosure closed up as a plain white wall, with a person's silhouette showing through the fabric
Box Altitude App: target 2,500 m, current altitude 350 m, 19°C, 60% humidity, 7 hr 51 min at altitude today
Empty enclosure shown end-on against white, clear walls over a slim dark frame with a lead running out
Box Altitude F20 altitude generator, a wide white cabinet on levelling feet
Box Altitude F10 altitude generator, an upright white cabinet with a brass hose fitting
Box Altitude Sensor, a small white cube with a perforated vent panel and embossed logo

Training Cloud Altitude System

The Box Altitude app on a phone, showing a simulated altitude of 2,059 m and 16.0% oxygen

What the system actually does

  • Accumulate altitude exposure while you sleep, without leaving home
  • Train at sea level so your key sessions keep their intensity
  • With sufficient exposure, suitable protocols may stimulate the body's natural erythropoietic response and contribute to increases in total haemoglobin mass
  • Set an altitude and the system reaches and holds it through the night
  • Review your own overnight response — sleep, oxygen saturation, resting heart rate and HRV — in Oxygen Coach

Many athletic protocols use sleeping elevations around 2,000–2,500 metres. New users should begin conservatively and increase progressively while monitoring sleep quality and recovery. Athletes with medical conditions, or concerns about oxygen exposure, should consult a qualified healthcare professional before beginning an altitude programme.

Athletes using it

“Sleeping in a Box Altitude Sleep Cloud has increased my recovery as well as my performance.”

Cam Wurf

Ironman professional, Team INEOS Grenadiers

“I was doing blocks in my Box Altitude tent. Altitude is quite interesting as it’s not just something that’s a one-time thing.”

Christian Meier

Ultra runner, former professional cyclist

“Box Altitude provides a solution with its altitude sleeping systems. We have seen that it has led to improvements for our riders.”

Mathieu Heijboer

Head of Performance

How it works

Set your altitude, climb into bed, and the system reaches and holds that setting through the night. The generator sits outside the tent and connects to it by a hose.

Frequently asked questions

How much bedroom space does the Sleep Cloud need?

The Sleep Cloud is a four-poster frame that stands over your existing bed. The King measures 2.35 m long × 2.35 m wide × 1.95 m high; the Queen measures 2.15 m long × 1.95 m wide × 1.95 m high. Your room needs at least 1.95 m of clear height for the frame, plus space to walk around it.

How loud is the altitude generator?

Two different numbers matter here. The generator itself runs at approximately 48–55 dB, roughly the level of a quiet dishwasher. Inside the tent it is about 31 dB, because the generator sits outside the Sleep Cloud and connects to it by a hose — so the sound you actually sleep in is well below the machine's own output. It is a steady, continuous sound rather than an intermittent one.

What altitude can it simulate, and what should I set it to?

The system simulates altitudes up to 4,000 metres (13,123 feet). Many athletic protocols use sleeping elevations around 2,000–2,500 metres, but the right altitude varies between individuals. New users should begin conservatively and increase progressively while monitoring sleep quality and recovery. Athletes with medical conditions, or concerns about oxygen exposure, should consult a qualified healthcare professional before beginning an altitude programme.

Do I have to train at altitude as well?

No. Training at altitude reduces the pace or power an athlete can sustain, because less oxygen is available. The Live High, Train Low approach separates the altitude stimulus from the training session: you sleep at simulated altitude and train closer to sea level, so your key sessions keep their intensity.

How long does it take to set up?

Usually 1 to 2 hours. The Sleep Cloud is portable and designed to be installed without professional help. Once the tent is assembled and connected to the altitude generator it is ready for immediate use. An altitude room, by contrast, is a full-day installation by a ventilation installer.

How long before I notice a response?

Most users are recommended 8–11 hours a day of exposure. How quickly a response appears varies considerably between individuals according to exposure, training status, recovery, health and iron availability, which is why we avoid quoting a fixed number of weeks.

What are the shipping and warranty terms?

Standard shipping is free on all products and deliveries usually arrive within 30 days. Box Altitude system hardware carries a two-year warranty covering manufacturing defects and system performance issues, with ongoing maintenance and support available.

Unsure which system to choose?

Tell us your sport, your training block and the room you have in mind, and we will tell you which system fits — or whether one does.