By now we all know that our hair and skin does some of its best work overnight, with a good night’s rest doing everything from regenerating new cells to releasing hormones and enzymes that boost growth. However, the way we sleep – or rather, what we sleep on – can also have a negative effect on both our hair and our skin. Whilst cotton pillowcases are great for breathability and are easy to wash, they also cause friction that can damage hair over time, not to mention absorb oils and dirt that