Welcome to the forum!

Stress can definitely be a dream-killer. After all, stress often affects your quality of sleep, which in turn affects your quality of dreams. It's perfectly okay to take a break from lucid dreaming to get decent rest if you need it - just don't forget to get back into it once your life gets less hectic.

Let us know if you have any questions, and feel free to stop by the IRC chat if you haven't already. And good luck on your finals!