I read somewhere (found it: https://www.wallbedsbywilding.com/blog/2017/01/06/wallbed-mattress/ https://www.wallbedsbywilding.com/blog/2017/01/06/wallbed-ma...)

I read somewhere (found it: https://www.wallbedsbywilding.com/blog/2017/01/06/wallbed-mattress/ https://www.wallbedsbywilding.com/blog/2017/01/06/wallbed-ma...) that a Murphy bed should use a special mattress to avoid permanent damage to the mattress caused by the foam sliding down to the bottom due to gravity. Has anyone experienced such problems with a normal mattress used in a Murphy bed?