Like it or not in the end it's one's body. It's literally what carries you through life. There's a reason for the saying 'If you have your health you have everything ' and it's true. Old age disease - these are the great equalizers.
At the end of the day sleep is a barometer of your emotional health. And so if you're not in the right place where you need to be then you're going to have voices keeping you up at night because you have to work through those issues.