Daydreaming and Insomnia

Recently I happened to note a blurb for an article on the Internet stating that daydreamers have a high incidence of insomnia, because they are unable to stop thoughts from coming into their heads.

Is that all it's been?

Guilty of having always been a chronic daydreamer, as well as being unable to sleep these days for longer than four hours at a stretch, I have only one question to ask, and that is, how exactly does one stop thoughts from entering their minds?  I know that ever since I was born, every minute thoughts have been making non-stop arrivals and departures in my noggin and rarely, if ever, even slowing down, 24/7.

(Of course the broken sleep may be mostly a matter of my bladder and kidneys.)