TUESDAY, Oct. 25, 2022 (HealthDay News) -- Why do some preschoolers refuse naps while others have a meltdown without an afternoon snooze? Researchers suspect it may have a lot to do with a specific memory-related part of the brain. While young children all need a lot of sleep, they do vary widely in when they stop napping during the day: Some leave naps behind by the time they are 3, while many others happily take an afternoon nap through age 5...