When I was a child adults often said, "You've got to eat a pound of dirt before you die", as they wiped the grit from a sandwich that had been dropped on the floor. Eating dirty did me no harm and I have a healthy immune system because of exposure to relatively benign germs.
The human species has co-existed with all sorts of micro-organisms for millennia and apparently we need a certain combination of them in our gut for good healthy. Fear of germs is overdone. We only need to avoid the most dangerous ones. I heard yesterday that
parents are afraid to give a baby some honey because it isn't sterile but surely honey is something that humans everywhere have been eating straight from the hive since forever. It may rot the teeth if eaten to excess but it isn't going to poison us.
As for sleeping clean, it is sufficient to wash the bedclothes regularly according to the season and to occasionally place the pillows in the sun to sterilise them. Invisible micro-organisms that might be thriving on our dead skin cells don't like the ultraviolet light from the sun at all. I always air the mattress cover on the clothesline every time I change the sheets. Our bed is clean enough and that is all that is necessary for good health.
