good afternoon alexander leonidovich, my name is marina kharitonova i am from the city of kashin, tveralways said that it is useful to sleep on solid, and recently on tv. i heard that during sleep, the spine should repeat the physiological curves of the body, and therefore sleeping on a hard surface is not recommended at all. i would love to hear, therefore, your professional opinion about it. well look i am not a mattress professional. i know that there are orthopedic mattresses. which are optimal which are all respected. i have one very comfortable. therefore, if we take aside the issue of an orthopedic mattress, which was specially developed for this. and this is optimal and correct on tv, said the mattress manufacturers and are grateful. i hope you have two options left to sleep on the soft freely hard and here i insist that she sleep because on the soft. what are my physiological curves, i have everything sunk and sagged. i have nowhere to run. and what happens to me, my back sags in an arc, because there is no time to rest, generally where, if i sleep normally, i rest against the