Studies have shown that REM sleep is crucial for memory consolidation, mood regulation, and overall cognitive function. It's the phase where dreams unfold, and your brain performs essential maintenance work. Their Performance Sleep Mask keeps you in the deep stages of sleep for longer. Ideal for side sleepers and travelers. This mask is extremely thin and stays flush to the face, while also providing a 3D cup so your eyes do not make contact with the mask. It is made using Bamboo Cool-Tech Silk & infused with silver ion.