Recent studies are uncovering how circadian clocks play a role in maintaining an organism homeostasis. In the model plant, Arabidopsis, time for coffee (tic) was originally reported as a circadian-clock mutant defective in sensing dawn because its clock incorrectly resets before morning. In this book, I present the results from a microarray study of tic. The mutant had a vast transcriptome reprogramming that resulted in an array of pleiotropic phenotypes. Besides its clock defects, tic showed hypersensitivity to oxidative stress, altered ABA-related responses, such as drought tolerance,...