I'm not suggesting I have to remember the dream (such as: ... grasping at...), but unless I have some sign like my eyes flashing (or no eyes flashing, but some memory of the dream I just had), how would I know that I wasn't still just lying in bed with my eyes closed trying to fall asleep believing I have only been in bed 20 min when really its been 200+,

certainly most people even those who have never reported lucid dreams have reported going to sleep lying down then looking up at the clock and seeing it is 8 hours latter, and even if they new about clock based reality checks I'm not talking about false awakening but simply the impression that their entire night of sleep passed as if instantly from their perception.

It may be true that if awoken in REM and quickly fall back in to dream as a Lucid that is DEILD
but equally true would be that you could wake in N-REM and just as quickly succeed in WILD having nothing to do with Dream Exit.