Sana is a smart sleep mask that helps you to relax and quickly fall asleep. As a therapeutic wearable, it alleviates sleep related problems like insomnia, post-traumatic stress disorder (PTSD) and chronic pain. Sana offers a completely non-invasive alternative through synchronised light and sound stimulation. Based on over 20 years of clinical research and development, Sana measures your heart rate variability and tailors the stimuli to enable you to relax and fall asleep, on average in less than ten minutes.