Several different ways. You don't need to dangle from the ceiling to hang yourself.
Just need to block off the airway or cut off the carotid. Just a little pressure will do the trick. I've seen tons of guys lying mostly flat 'hanging' themselves.
And yes, with bed sheets, or almost anything.
Shouldna' had no sheets.

Insider administration arranged an awfully lot of things to go wrong.
SDNY probably despises Barr, happy to Off his prize prisoner.
Insider war going on in the JD/ FBI.
Remember something floating around yesterday about the cells in that secition had nothing to tie anything to, and the sheets were very thin and would rip/tear.
I wonder what the source of the NY Post article is.