Daylight Saving Time: What lack of sleep is doing to our brain Uncredited and last updated 2021-03-15 13:52:34-04 WACO, TX â With one less hour of sleep, Baylor-based sleep and cognition experts say it's more important than ever to be well-rested. "We mainly study sleep, memory and cognitive functions," said Chenlu Gao, a doctoral candidate from Baylor's Sleep Neuroscience and Cognition Lab. "You know this year is a very special year because we are coping with Covid-19 and sleep actually plays a large role there as well because sleep affects our immune functions," said Gao. Daylight Saving Time 2021 even more meaningful than ever, as Gao explains our response to the Covid-19 vaccine can be affected by our quality and quantity of sleep.