If you've read some of my older poss the you would've seen me talk about how blue light mimics natural light and inhibits melatonin production (that thing that regulates sleep). In addition you may have heard recently in the news that people have been talking about its negative effects on circadian rhythms and the like. What I'm saying today is that being awake and alert at the right times is actually good!
Driving home late at night, working hard and needing to out perform your normal levels then blue light might be a good way of doing it. In the study below scientists compared the effective of caffeine and of blue light on the performance of people in certain tests. The interesting thing is that exposure to blue light actually increased results in these tests more than exposure to caffeine.
So want to get that extra little help but don't like tea or coffee, now there's an answer for you - blue light. Light from LED backlit screens or certain apps on your phone will work. As will natural light (that's got blue light in it too). But be careful. Exposure too close to bed time (after 6pm) could inhibit sleep, just like caffeine.
On a final note it's interesting to see that combining the two can increase results even more. So if you're extra sleepy or need élan extra boost ten forget your energy drinks, just have a cuppa and get some blue light in your eyes - that should do it!