How Dreem uses pink noise to improve your deep sleep
Your inner ear is a kind of big generator — it receives synchronized sounds and turns them into electrical impulses that are interpreted by your brain to improve the quality of your sleep. As explained in our previous article Dreem relied on the scientific research of Jan Born, who proved that a precise sound, used at a given moment, can synchronize with your brain waves to stimulate deep sleep.
Do you have some difficulties to visualize the process? Think of your brain as an organic orchestra. When you fall asleep, the rhythms of its music slow down. In deep sleep, the tempo reaches its slowest point, about 1 Hertz. This means that your orchestra plays for half a second, is silent for the next half-second, and so on. Dreem’s sensors can record these “slow waves”.
During the night, the amplitude of your brain activity gradually weakens, which means that you are more and more agitated. Even worse, when you’re stressed (and as you get older), the orchestra in your brain becomes lazy – further reducing your EEG amplitude and resulting in poor sleep quality. This might not sound terribly wrong, but deep sleep deprivation has been directly linked to reduced cognitive and behavioral performance, depression, memory loss, neurodegenerative, cardiovascular and other chronic diseases.
Technology for a better sleep
Thanks to the encephalographic electrodes, Dreem is like a conductor who ensures the deep sleep stays in sync all night long. It detects the different stages of your sleep and follows its variations in real time. During the deep sleep phase, it detects the impulses of the thalamus and, during very specific moments, emits short pink noises that amplify its action. These sound stimulations are like a metronome used to remind the instrumentalists when to play. This synchronicity means that your slow waves stay at the right rhythm and volume all night, leading to positive effects on your sleep.
Pink noises are audible; but by definition, they intervene during your deep sleep: you do not perceive them consciously and they will not wake you up. These sound stimulations working through the bone conduction system, will be audible only by yourself.
The quality of sleep is measured according to two indicators: the number of waves produced during the deep sleep phase and their amplitude. The pink noise diffused by your Dreem headband has the effect of increasing the amplitude of the slow oscillations (+ 28%) and of multiplying them (+ 32%). Your deep sleep is thereby optimized and of better quality.
The effects of these tiny musical notes generated by the Dreem headband can be directly observed on your EEG. It usually looks like this:
Nietzsche once said: “A life without music would be a mistake”. At Dreem, we believe that a night without the right music could be too.
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