Yes, you're definietly on the right track for a WILD.

For me it also often happens unintentionally, mostly when I start to recall dreams in the morning after I woke up, then often don't move but concentrate solely on recalling the images, and suddenly I notice that I slipped in a state where I can't move anymore, starting to hear weird noises, weird buzzing that feels like it is coming from the back of my head (that is the most scary for me).. and more often than not also voices that start to talk.

It is very hard for me to stay calm through it, and until now every time I aborted and tried as hard as possible to move my body to stop it. But I hope that I become more used to it so that the angst goes away and I will be able to use these unintentionally WILDs to enter a dream lucid.