Commissioned research.
Real clinical settings.
Disclosed findings.
Four KD Navien-commissioned studies — two using full polysomnography in accredited medical facilities — suggest that precision sleep surface temperature control may support sleep quality. All studies conducted in controlled clinical settings. Individual results will vary.
Sleep temperature research is rarely funded at this depth outside of pharmaceutical or hospital contexts. KD Navien — with 48 years of precision temperature engineering — commissioned four separate studies with independent academic and medical institutions to understand exactly how temperature control affects sleep. These are their findings.
Temperature isn't comfort.
It's the switch.
Sleep onset is initiated by your body shedding core heat — a process called distal vasodilation. Your hands and feet warm as they radiate heat outward, dropping core body temperature by 1–2°F. That thermal drop is what signals your brain to transition into deep sleep.
When the sleep surface retains warmth, this mechanism is impaired — your nervous system stays partially alert, deep sleep stages shorten, and you wake more easily. When the microclimate at the sleep surface is precisely managed, your body achieves and holds deeper stages more efficiently, all night.
This is what direct sleep surface temperature control does that air conditioning cannot: it acts precisely where your body meets the bed, with 1°F precision, adapting to each sleep stage in real time.
Sleep lab data.
Clinically measured.
Two full polysomnography (PSG) studies conducted at clinical medical facilities in Korea using the Asleep AI sleep stage detection platform. Both studies commissioned by KD Navien. All results are group averages vs. no-mat baseline. Individual results will vary.
Effect of stage-adaptive mat temperature on sleep quality
Effect of AC + real-time stage-adaptive mat temperature on sleep quality in summer
PSG is the standard measurement method used in sleep medicine — EEG brain wave monitoring, eye movement tracking, and oxygen saturation measured simultaneously in a clinical environment. These are not consumer sleep tracker estimates. The same method is used in sleep disorder clinics worldwide. Results from these studies represent group averages under controlled conditions and are not a guarantee of individual outcomes.
Energy savings
and sleep quality scores.
Two controlled chamber experiments measured energy consumption and sleep quality simultaneously — one in summer cooling conditions, one in winter heating conditions.
Optimal indoor and skin-contact temperature conditions for comfortable summer sleep
The combination of a slightly warmer room (27°C) and active mat temperature control produced the highest rated sleep quality of all six test conditions — while using significantly less energy than AC-only cooling.
Low-energy comfort and sleep efficiency improvement using a boiler-connected water mat
Lowering the room thermostat and compensating with direct mat warmth at the sleep surface produced higher sleep quality scores than room heating alone — at substantially lower energy cost.
The summer study is directly applicable to US homes using air conditioning. The winter study was conducted in a Korean boiler-heating context and may not directly translate to US HVAC systems. The underlying principle in both cases is consistent: conditioning the surface you sleep on requires less energy than conditioning an entire room.
- The Dankook University studies were conducted by KD Navien's contracted research institution using Navien sleep mattress pad products under controlled laboratory conditions in a Smart Living Testbed chamber. Actual results in home environments may vary based on mattress type, room size, ambient temperature, and individual physiology.
- The polysomnography studies (Clionics, G&G Hospital) were commissioned by KD Navien through Asleep, an AI sleep stage detection platform. Studies were conducted using Navien sleep mattress pad products under controlled clinical conditions. Each participant completed 3 PSG sessions. Results are measured vs. no-mat baseline control conditions.
- The sleep architecture visualization above is illustrative and derived from PSG study group averages. It is not a representation of any individual's sleep pattern.
- All statistics represent group averages across study participants. Individual results may vary.
30 nights to find out
if it works for you.
Free shipping. Full refund if it doesn’t work for you. No subscription.