The Complete Guide to the Science of Circadian Rhythms
This is a really good article about timing and the need to:
a) understand your daily rhythm and
b) work with that…
…in particular in terms of Sleep; Eating and Exercise. Working as a coach and being objective to my clients life it can be really easy to see that they are not getting good quality sleep or are just out of balance.
Understanding this can help you find your way back.