As for the cardinal sin of going to bed with make-up on, Boudoir Beauty Parlour's Asma Docrat says it's a big no-no. €You wouldn't go to sleep with mud on your feet, so why would you leave make-up on your face? It will make the skin look dull, dry and will cause spots.€
In addition, the skin won't get a proper chance to recover from the free radical damage it has been exposed to during the day, so advise against it.