I have been waking suddenly from a deep sleep to smell strong odors such as burning rubber or the smell of smoke - only to search the house and find nothing. The smell lingers for a few minutes, then is gone. This has only happened about four times over the past 12 months. I am female, 50 years of age, overweight, take Metformin, Lipitor, blood pressure tabs, estrogen and antidepressants.