What sleeping in your make-up does to your skin: Shocking experiment exposes what happens if you don't cleanse before bed

Before and after: Experts said Anna's skin aged by ten years as a result of not removing her make-up for an entire month.

Do you always take off your make-up before bed? Every night? Even after a glass of wine too many? Or when you've fallen asleep on the sofa? Or you simply couldn't muster the energy? You're not alone. In a recent survey, a third of women questioned confessed to sleeping with their slap on at least twice a week. Yet those very same women did so despite believing that skipping their skincare routine before bedtime would give them spots, dry their skin and make their eyelashes brittle.