A lot of what sleep biohackers do to themselves, an institutional review board would not let scientists do to them, reports Men’s Health.

In general, Asprey says that he has spent more than $1 million on his biohacking efforts. He estimates that $200,000 of that sum has been spent on hacking his sleep. Unlike most medical experts, he eschews traditional wisdom that quantity is important when it comes to sleep (i.e., how many hours of shut-eye you get per night), citing research suggesting that sleeping only six hours a night can increase longevity.