Circadian disruption results in changes in emotionality. Emotionality was assessed by OFT and LD box (LDB) task. CD mice entered the center of the OFT faster than controls (t test, P = 0.0006; A), while not spending any additional time in the center per entry (t test, P = 0.1331; B) or demonstrating any more locomotor activity (t test, P = 0.3735; C). In the LBD, CD mice emerged from the “safe” dark compartment into the bright compartment much faster than controls (unpaired t test with Welch's correction for unequal variance, P = 0.0277; D), and without making any more attempts to enter the region (t test, P = 0.2608; E) or spending any more time in the lit region (t test, P = 0.1905; F).