not so much these days, but have in the past, and some pretty terrible ones too. The medico that deals with this sort of thing told me it's your suppressed anxieties that manifest itself in dreams, nightmares, and i would say that there is a ring of truth in that. If you have fears, could be anything, try and address it in the day time, and stay away from cheese, coffee, wine if you can in the evening. Some medications can made your sleep disturbed as well, i could write a book about some of this stuff, rather too much