Multitasking is commonly practiced by millennials but can reduce productivity and increase stress. While the brain can listen to music and do other tasks simultaneously, rapidly switching between complex tasks overloads the brain and reduces performance. Studies show multitasking leads to up to a 40% drop in productivity and 10% reduction in IQ. While multitasking may give a sense of motivation and productivity, evidence suggests it actually increases stress and reduces focus, efficiency, and work quality. Experts recommend setting boundaries and focusing on one task at a time to avoid these negative impacts of multitasking.