Anyone else experienced chemical fume torture?

Over the last year I have periodically noticed a strong chemical smell like burning plastic which takes my breath away, stings my throat and leaves me with a headache. Others have noticed it too although not as much as me. I assumed someone must be burning rubbish or something nearby and it was seeping in from outside. However, more recently I’ve noticed a clear pattern as to when the smell appears. Whenever I am drifting off to sleep, the precise moment I fall asleep, the smell instantly fills my nostrils and wakes me up before dissipating a few seconds later. I’ve tried this day and night, in different rooms and I get the same results. This is obviously infuriating and stops me from sleeping properly (although thankfully once I do manage to fall into a sustained deep sleep it doesn’t persist). I haven’t told anyone about it since I don’t know how to explain it without sounding crazy. It surely has to be controlled by something that can detect my brain state because simply lying down with my eyes closed doesn’t trigger it, only actual sleep triggers it. Given that there must be some serious tech behind this, it must have been tried on others who could confirm having a similar experience to this.