Tesla Inc. (NASDAQ:TSLA) and SpaceX CEO Elon Musk opened up about what keeps him up at night, the immigration situation in the U.S., aliens, and more. What Happened: On Monday, Musk had a conversation with Mike Milken, the chairman of the Milken Institute at MI Global. Their conversation was posted live on the tech billionaire’s social media platform, X, formerly Twitter. Here’s a brief on what was discussed: Immigration Has Gotten Worse “I’m a big believer in immigration, but to have unvetted immigration at large scale is a recipe for disaster,” Musk said. According to him, the government sho…