Sounds like the perfect time to do a dream journal to me -- if you still remember, and don't mind waking up, keep a book next to you. Write down what you remember immediately -- I've had many instances where I've not even remembered writing the entry, but on reading it again the dream often comes back to you and gradually it will help you remember the dream.

At which point you can feel free to get up and not worry about remembering the dream, as you have a perfect method to remind yourself of it.