https://www.cnbc.com/2018/08/17/tesla-board-members-reportedly-concerned-about-elon-musks-use-of-ambien.html

Telsa board members are concerned about Elon Musk's use of Ambien and recreational drugs, according to an explosive interview with The New York Times published late Thursday.

Musk said in the interview he now needs Ambien to sleep, but board members are concerned that the drug isn't having the intended effect for Musk, the New York Times reported citing an unnamed source. Instead they fear it's fueling his controversial public statements. The report also says board members are aware that Musk has used unspecified "recreational drugs."