Michael Jackson’s struggle with insomnia made headlines in 2009. But he wasn’t the only celebrity to wrestle with sleepless nights.Miley Cyrus told fans about her sleep problems on her Twitter page. “I have just diagnosed myself. I am an insomniac,” wrote the teen star of Hannah Montana. “I hate when I can’t sleep.”Boston Red Sox slugger David Ortiz battled insomnia as he struggled to find his