Modern Mid Century Full Bed.
You will basically build a large box that will sit up and down so the mattress can rest on top of that platform. Use discs measuring 2 inches thick and 8 inches wide. Fill the platform bed with a plywood plate to fit over the top of your box frame.

Big Mid Century Full Bed

Low Mid Century Full Bed

Nice Mid Century Full Bed

Review Mid Century Full Bed

Simple Mid Century Full Bed

System Mid Century Full Bed

Traditional Mid Century Full Bed

Wooden Mid Century Full Bed