The simple behavior that I do believe everybody should adopt... is to view, ideally sunlight, for 2-10 minutes every morning upon waking. So, when you get up in the morning, you really want to get bright light into your eyes because it does two things. First of all, it triggers the timed release of cortisol, a healthy level of cortisol, into your system, which acts as a wake-up signal and will promote wakefulness and the ability to focus throughout the day. It also starts a timer for the onset of melatonin.