Jon Stewart had a rough time hosting The Daily Show. By 2015, he hadn’t had a good night’s sleep in years. Exposure to Fox News had taken a toll. Writer Chris Smith chronicles Stewart’s reign in a new oral history, which looks at the comedian’s broader impact on political culture.  For the Spiel, Mike has cat scratch fever! Literally.   Today’s sponsors: Betterment, the largest automated investing service. Get up to six months of investing free when you go to Betterment.com/gist.  And Bon Appetit. For a limited time, you can give a one-year subscription to Bon Appetit for 15 percent off. Plus, they’ll even throw in a cool tote bag! Get this deal today by going to bonappetit.com/giveBA and use promo code 15OFF.Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.Learn more about your ad choices. Visit megaphone.fm/adchoices