SAN FRANCISCO (KGO) -- Tesla shares dropped nearly 9 percent after the New York Times reported stress is taking a heavy toll on CEO Elon Musk.[br /][br /]In the devastating report, Musk told the Times he has been working up to 120 hours a week and taking Ambien to get to sleep.[br /][Ads /][br /]Musk created a stir last week when he tweeted that he wanted to take Tesla private.[br /][br /][b]RELATED: [url HREF="https://abc7news.com/business/elon-musk-shakes-tesla-investors-fans-of-the-company-with-one-tweet/3903760/[br /]" TARGET="" REL=""]Elon Musk shakes Tesla investors, fans of company with one tweet[/url][/b][br /][br /]Tesla closed at $305 a share, down 30 points Friday.[br /][Ads /][br /]This week alone Tesla has lost $8 billion in shareholder value.[br /][br /]Executive Director of C-Net, Ian Sherr, stopped by ABC7 News to talk about the implications of these changes for Musk and Tesla.[br /][br /][b]For more stories, photos, and video on Tesla and Elon Musk, [url HREF="http://abc7news.com/tag/elon-musk" TARGET="" REL=""]visit this page[/url].[/b]