What changes in living conditions occurred from the medieval era through the 1800's?

The Medieval Living conditions were very harsh:
-very poor
-often, houses were built without windows. Which would affect their security, warmth, and clothing situations.
-horrendous weather, constantly using thick layers of blankets.(often for the peasants, they didn’t have thick or any blankets.)
-overpopulated
-lack of supplies for the sheer mass of people
-hygienic conditions were just nonexistent
-many people died due to sicknesses and illnesses

1800’s: Hygiene and poor health didn't even come into the calculations until the 18th century - when antibiotics were created.