To tell the truth, I have no idea (at this point, at least) how to distinguish for sure between sleep stages without special equipment. Conscious NREM to me usually takes on one of the following forms:
- A sort of underwater/“rumbling” sound in my ears (which seems to be the lightest stage)
- A more quiet/muted state (apparently a bit deeper), but one that's still noticeably different from merely lying awake in bed
- Deep/delta NREM, which is
a different experience altogether
Any of these can be accompanied with HH or random thoughts/dreamlets (or even NREM dreams). For me personally, it's usually pretty clear whether I'm in conscious/lucid sleep vs. lying awake, but I've heard others give different experiences including those in which lying awake vs. being asleep is hard to tell apart. I therefore get the impression that this is something that's likely to be totally different for everybody.
The advice I usually hear, though, regarding WILD attempts is that it's best to try not to worry about whether you're asleep or what stage you're in but just try to be patient and stay focused on the upcoming dream, which should (eventually) arrive.