At some point, we have all used the phrase 'beauty sleep' but most of us don’t realise just how much happens to our skin as we do sleep. When we start to understand all of the processes that happen in the skin at night, both good and bad, we start to realise why night creams are so important! So what does happen to your skin as you sleep? And what should you look for in a night cream to get the best results for your ageing skin?