I think the answer to your first question is: You are less likely to slip into the deeper levels of sleep during a nap. Your body isn't gearing down for full, restorative, sleep. It is simply resting lightly. Think of it as how a cat sleeps in a sphinx position, straight up, still alert even though it seems that its body is shut down. You are more likely to have vivid dreams in a nap because you are closer to the REM wavelength (if not already in) during a mid-day nap.
And yes, it is very possible to have DILD's during your first 5-6 hours of sleep. Your first REM cycle starts approx. 90 minutes after drifting off to sleep. Anything after that is fair game.
Hope this helps.
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