@porcelainchild The indentations in my matress worried me in the early months as my feeling was baby could get her head positioned in an indentation and make it harder to roll. I bought sheet clips that allowed me to stretch my sheet very tight over my matress which felt like a good fix. My next port of call would have been to put a sheet of flexible cork under the sheet to cover the indentations. I think @cosleepy on instagram has something about this regarding measures for hotel beds?