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 Is this a universal constant with no solution?
A sheet will crease and wrinkle under you?
Even with a fitted sheet?
Even an elastic material?
Even with straps under the mattress to try a pull it tight?
Is there really no answer?????
https://toot.me.uk/system/media_attachments/files/112/129/436/914/000/837/original/4f12c9585e638c11.jpeg
 
 nailgun.

But your sheet seems like it might be too deep for your mattress as I don't tend to have this problem with our fitted sheets (particularly after they've been washed a few dozen times and have shrunk a little).

...or you flail around in your sleep *a lot*?