wisdom tooth removal

i got 4 teeth removed on tuesday morning and im still using gauze because there’s still a little bleeding, is this normal ? i keep reading online that they only needed it the day of the extraction and not the next day but i seem to be healing okay. also i find it comforting to sleep with the gauze in over night to it doesn’t feel so open with air hitting it , which i also read you shouldn’t do. why not ?