1, the bed board is smooth.
Because the bed board is exquisite and smooth, and the friction coefficient is small, the mattress laid on it will slide with the movement of the human body.
2. The mattress is thinner.
Because the thin mattress lacks enough weight, it will slide and shift with the movement of the human body when spread on the smooth bed board.
3, one nail positioning.
You can use the most direct and effective method to nail the thin mattress to the bed board with ordinary round nails, so that the mattress will be fixed once and for all and will never slide left and right again.