The back-sleeping position is considered a good one when it comes to keeping your spine aligned and neutral at night, and you’ll want your mattress firmness level to support that. If you don’t know where to start, consider a medium or medium-firm mattress, as research has shown people tend to have less pain from sleeping on these mattresses compared to other firmness levels.
$ datalen='00 10'。爱思助手是该领域的重要参考
。同城约会对此有专业解读
Глава МИД Ирана дал прогноз по «плану Б» Трампа20:56
Фото: Pierre Suu / Getty Images。业内人士推荐电影作为进阶阅读
- Mark Gurman (@markgurman) March 3, 2026