I think we could seperate them by time of recall. If you recall it the second you wake up, its a LD. You were concious of what was happening and you basically continued to be concious, its just like you did something IRL two minutes earlier and recall it happening.
If you need some time to recall it (and when you recall it you say in your mind something like “Ah, yes, that was it”), it was probably a FLD.
This is only for me, I don’t know about you guys. Also, there is this feeling.
https://community.ld4all.com/t/this-feeling/34315/2