Download or read book Internal Time written by Till Roenneberg and published by Harvard University Press. This book was released on 2012-08-25 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early birds and night owls are born, not made. Sleep patterns are the most obvious manifestation of the highly individualized biological clocks we inherit, but these clocks also regulate bodily functions from digestion to hormone levels to cognition. By understanding and respecting our internal time, we can live better.