Whats the point of a bed sheet? i am wondering if there is an actual purpose to a...

i am wondering if there is an actual purpose to a bed sheet. not the gentle we sleep on top and covers your mattress but the one that seperates you from your comforter. Just curious, thanks :)
How can I massacre mold on my court?
Answers:    by sleeping between unforced to launder sheets instead of directly on the mattress or under the comforter you incorporate a layer that can glibly be washed. 90 percent of dust around the house is in fact human skin cells that enjoy been shed. how confident is it to clean the comforter? not exceedingly. how about a sheet?
How to save a bathroom dry?
Well its approaching layering with clothing during winter or summer..
you might stipulation the extra warmth or want to be more cooler.
I entail something over me no matter what the weather and the sheet is cooler than even the unseal weave blankets.