Warning: Undefined array key "visitor_referer_type" in /var/www/vhosts/wordinf.com/core/app/libraries/Core.php on line 98 Sanjay Gupta - Sleeping only six hours a night for a...
Sleeping only six hours a night for a week in a row will make you feel on that eighth day as if you'd gotten no sleep at all. Seven and a half to eight hours remains the sweet spot.