I think if you look after yourself on a regular basis, and do the prep beforehand, you don't need to put lots of effort into looking good. It's about finding the right balance - if you have a good diet, drink lots of water, exercise regularly and sleep, you won't look bad on a regular basis. Then you can afford the occasional naughty slip up once in a while, going out and having a delicious glass of wine with friends, having a great laugh and chat then realizing its 2am isn't so bad - you've put in the hard work!