Sorry to hear about your accident hope you get better soon

Well, you can just practice normally and do not perform any WBTBs unless you wake up during the night. I would strongly advice not to risk loosing any rest just for lucid dreaming until you're back on shape and feeling fine.

You should take this chance to practice your dream recall. Better dream recall always means more chances of lucid dreams. You can even practice techniques like DILD or MILD since they don't require you too loose any sleep. Don't waste too much time with your mantra though, if it's keeping you from falling asleep, just do it for 5minutes and then clean your mind.

Remember, a good rest is the top priority for lucid dreaming