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These products are facing increased scrutiny, though they are still not officially approved by any US government regulatory agency
Pizac, Associated Press file Brian Kersey, Associated Press file Tom Gilbert, Tulsa World via The Associated Press Chris Pizzello, The Associated Press Roger Kisby, Getty Images Charles Sykes, Associated Press file Chris Brandis, The Associated Press Alessandro Della Bella, The Associated Press Patrick Doyle, The Canadian Press Images via The Associated Press Fin Costello, Redferns The Associated Press Rick Diamond, Getty Images for IEBA Joel Ryan, Associated Press file Andreas Rentz, Getty Images Peter Kramer, Associated Press file Evan Agostini, Invision/The Associated Press Chris O'Meara, Associated Press file Chris Pizzello, Invision/The Associated Press Reed Saxon, The Associated Press Vince Bucci, Getty Images Marianna Massey, Getty Images Vince Bucci, Getty Images Amy Harris, Invision/The Associated Press Frederick M
The human brain continues to develop into the mid-20s
Even if total sleep time appears normal, the restorative value of that sleep is sharply reduced
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