I can't describe it well but this happens sometimes, mostly when I'm calming down from a stressful day. It feels like anxiety, I guess, but it's bizarre.
It feels like I'm sleepy, like real sleepy, without the fatigue. You feel light, somewhat unfocused, and you can feel your body but it feels lighter and looser. I originally would freak out over this but after a few times I've come to the conclusion it is not dangerous. It doesn't seem brain tumorish either; it's not exactly depersonalization.
I'd rather feel normal instead of feeling like I just got my tooth pulled. I've been awake for 13 hours so right now it's not bizarre but I've had it happen in the afternoon.
I've been having a lot of fatigue and sleep issues lately. It's just not the same as it was months ago. I can sleep if I want to so it's not insomnia.