In collaboration with Raphaël Aphan (Supélec) and Professor Damien Léger (Center of Sleep and Vigilance), Patrick Jouin designed NightCove, a sleep improvement system developed by Zynek, which operates on various physiological parameters to effectively improve sleep quality.

At bedtime, NightCove spreads a twilight-like light whose wavelength helps the individual to fall asleep. Similarly, upon awakening, the light wavelength, emitted with progressive intensity, recreates the natural brightness of the dawn, and inhibits melatonin production. It gently eases into a light sleep phase until the awakening. These light programs are combined with sound programs whose rhythms accompany those of the metabolism. They are relaxing and soothing in the evening, and stimulating in the morning.