Scientists are providing a fuller understanding of the essential role that sleep plays in brain health, identifying an abrupt transition at about 2.4 years of age when its primary purpose shifts from brain building to maintenance and repair.from Top Movies News- News18.com https://www.news18.com/news/movies/if-you-do-not-snooze-you-lose-sleep-seen-as-essential-for-the-brain-2890075.html