If you're diagnosed with insomnia, and it's to the point that it's affecting your job performance, get a note from your doctor and inform your employer. Otherwise, they're not going to take you seriously because insomnia is common. It's like depression. Almost everyone at some point in their lives will experience it. That's just reality. I wish we lived in a world where we could just call in when we feel like hell, but it is what it is. I agree with the other poster, if someone had that many unexcused call-ins, I'd fire them.