With my clientele I repeatedly find that women in particular wash the life right out of their hair. Depending on lifestyle and profession, the average person need only wash their hair three times a week. One of the healthiest things for human hair is sebum—its natural oil. If your hair feels dull and dry, you may need to give it a break. A good "rule of thumb" is that if you smell good and your hair does not look like you "brushed it with a pork chop," do not wash it.
One of the hottest tips for looking fresh is to buy a shower cap. Plastic cheesy flower caps come to mind; however, buck up and get one. A shower cap will allow you to shower without trying to keep your hair dry. It will save your hair and blow-drying time each morning. Due to the oil naturally found on your forehead, bangs are the first to look greasy. Place the cap on your hair and leave your bangs out. Shampoo just your bangs. This leaves you with only the task of drying your bangs and freshening up your hair with your styling tool of choice.
Hot rollers are back with a vengeance. They are a quick way to diversify your look. If you have not used them in a while, pull them out and "dust them off." In case you have to work through some styling difficulties, try a new style for the first time on your day off—you do not want to be late for work.