circadian rhythms

• S: Circadian rhythm research has practical applications from understanding how blue light from devices disrupts sleep how to combat the adverse effects of jet lag and shift work and understanding the circadian blood pressure rhythm helps w/ timing drug treatments
• S: Vetter found 27 office workers who were exposed to strong blue light shifted the timing of their circadian rhythms to match the office lighting, suggesting that artificial light is a strong exogenous zeitgeber for the sleep wake cycle
• L: psychologist's have criticised the use of artificial lights in isolation experiments on the sleep wake cycle suggesting the artificial lights disrupted the free running circadian rhythm measurements by acting as an exogenous zeitgeber other studies that controlled for artificial light found the circadian rhythm was closer to 24 hours w/ little drift