You can't remember your dreams. Every time you wake up, they are gone like they were never there at all.
But you remember your nightmares. Those times when you wake up in a cold sweat and you have trouble remembering where you are, who you are, because the nightmare is still with you, is still in your mind, is still your reality.
And sometimes, when that happens, you think you can still see it - your dreams - bleeding around the edges of the world, of everywhere you look. It's shining silver lines at first that appear and you think it's just because you've rubbed your eyes so much, but then they don't go away. And then they become rips and tears and you can see through the world and into your dreams.
If this ever happens, just close your eyes and try to go back to sleep. If you don't, if you look through those tears, if you look into your dreams while awake, you never know what might happen.
Perhaps there's a good reason why you don't remember your dreams.