Have they found a cure for the tiredness epidemic?

There’s a lot of attention right now on nootropics, or brain boosters. The marketing is telling us these over-the-counter supplements will keep us awake and alert, and even improve the way our brains perform. But should we believe the hype? Guardian contributor Bianca Nogrady says … it’s complicated. You can support the Guardian at theguardian.com/fullstorysupport