Which sheets for the baby's bed?

So I know I’m not supposed to have loose bedding or anything like that, but does it count if I tuck a blanket super tight like a sheet?? Underneath looks so uncomfy and I’m not sure if this is alright or a sids risk

So I'm curious... i have a king size bed an last night i put this in our bed with baby in it an she slept fine cause apparently she dont wanna sleep no where else unless it near me or on top of me an being on top of me even though im a light sleeper scares me. I was told it was okay to have this in the bed by some ppl an others say is super unsafe along with every other way. So pretty much if my baby isnt sleeping on a board with a sheet an no blankets etc it unsafe. No matter what you google everyway is unsafe. My girl hates swaddling. She hates her bassinet or layin on hard surface. I hear some babies hate laying flat due to reflux etc idk what else i can do

August moms: What is still on your to-do list before baby comes? Here’s mine. -Install car seat base -Wash baby clothes and bassinet sheet. -Put together dresser and bassinet. -Test out car seat and stroller -Finish packing my hospital bag and husband needs to pack his. -Put together birthing plan -Make padsicles -Clean bottles, pacifiers, and breast pump -Baby shower is on 7/17 so buy any remaining items that I may need.