Summarize this article in one sentence.
Sleep is arguably the most important part of looking fresh. After all, when people are thinking about freshness, the first thing they think of is probably someone who is at the start of their day following a long and fruitful rest. People who sleep at least 8 hours per night actually feel more attractive, and they tend to look it too. Prolonged sleep deprivation comes with a laundry list of negative traits, not least of which includes dark eye circles and a bloodshot complexion.  If you find yourself having trouble getting to sleep at a normal time, try making a point of going to sleep at the same time each night. It may be tough to adjust to at first, but your body will eventually fall into the habit of tiring out at that time. Oversleeping isn't usually as big of a risk for people, but it is something you'll want to be mindful of. If you oversleep, you'll feel just as groggy as you would without sleep, but you'll have also lost precious morning hours while you're at it. Freshness has a large part to do with the way your hair looks. Greasy hair doesn't make for a good look on anybody. Though rinsing your hair in the shower each morning is recommended and feels good, you may not need to use shampoo as often as you think. Everyone's hair has its own set of needs, so rather than sticking to a single strict guideline, it's best to listen to your body's indicators and do what seems best.  The amount you shampoo your hair should depend in part on your lifestyle choices, most specifically how physically active you are. The more physically active, the more often you should clean your hair. Overwashing with shampoos is a bad idea as well. Although no one will ever hold a value on hygiene against you, you can inadvertently remove healthy natural oils out of your hair (and skin!) by overdoing it on the hair cleaners. Eating well is something everyone knows they should do, so it is lamentable that few follow through with it. Nonetheless, it should be made a priority if you want a fresher look. A healthy diet is manifest in virtually every part of your body, from the hair to the skin and everything internal. Although each person's diet should be custom-tailored to match the needs of their body, there are probably some things you eat regularly you know you could do without.  Cutting out 'empty calories' (like soda) and replacing them with healthy alternatives will transform your appearance by itself in as little time as a month. Eating well has a considerable effect on your mood as well as your appearance. Being in a chipper spirit will make others perceive you as fresher than they normally would otherwise. Cardio exercise involve exercises like swimming and running that strain the lungs and heart. The benefits for these exercises are numerous. Not only will your lungs and heart get significantly stronger, your skin will look tighter and you're bound to lose pounds if weight is a current issue for you. Don't worry if you lack motivation in the beginning. Once you get going, the subtly-addictive properties of the endorphins will keep you coming back for more once you've made a habit out of it.

Summary:
Get enough sleep. Wash your hair regularly. Eat well. Get regular cardio exercise.