I've had this problem a few times too. The good news is that the longer it takes me to go back to sleep, the more aware I seem to be in my dreams after that. A lot of my good lucids have come after what I thought was a jank WBTB because I couldn't go back to sleep for a few hours afterwards. Lately I've just been waking up to go to the bathroom and going right back to bed. Something as simple as sitting on the edge of my bed for 10 seconds can give me enough wakefulness to get in the right mindset before falling back asleep.