I spend a lot of time talking about and researching sleep. Most people have no idea how important sleep is and how far reaching its affects are. From what I understand, and I've done a lot of research, sleep impacts every aspect of your life in either a positive or negative way. Like most things in life it's quality that's important as opposed to quantity.
Most of the advice I see about improving sleep has to do with improving your sleep environment (temperature, light, etc.) and discipline (going to bed and rising at the same time every day, avoiding caffeine, etc.). Very little has been mentioned about how to maximize the time AFTER sleep... and those minutes and hours are almost as important.