Well if you want a good nights' sleep the way to get that is by learning how to move your attention away from the frightening aspects of the dreams. Whatever you feed attention to in a dream grows more powerful - and now you're feeding the frightening aspects. All you need is something different to focus your attention on. That can be anything different really - the fascinating aspects of lucid dreaming - the fun aspects, the adventure... whatever. But it needs to be something. Because right now it's like this - you start to dream and, out of long habit, you automatically concentrate on the scary stuff thus feeding it and making it grow stronger. I think we all know the way to break a habit is to develop a new habit to take its place, otherwise the old one will just come back. To stop smoking start chewing gum or something, right? Otherwise your mouth is just watering all the time for that next ciggy and it's all you can think about. But if you give yourself something to chew on that makes a huge difference.

So your choice is pretty much continue to have the scary dreams like you've been doing, or start to concentrate on other things you can do in the dreams. And don't think that by doing things in your dreams you're missing out on a good nights' sleep - you dream every night regardless - several times. So you're going to be dreaming about something. You can either let the scary dreams continue or learn how to replace them with fun dreams. Your choice. I don't see what you've got to lose really.