Want to know how good your reflexes are? Here is a great website with a program that tests reaction time. The website is supposed to illustrate the correlation between sleep deprivation and poor reaction times, but we can use it to see how fast we can react. It is kind of fun and you should do it for the entire five minutes. At the end it gives you an average.
http://healthysleep.med.harvard.edu/need-sleep/whats-in-it-for-you/how-awake-are-you