Hi mattress experts and enthusiasts! I recently bought my first ever bed in a box, sight-unseen mattress, an Allswell Luxe Hybrid. So far, it is not going particularly well. I have had it about three weeks, and have yet to have a night of sleep on it that I would describe truly as “comfortable”. To be clear, I always lie down on it, feel that it is comfortable, fall right to sleep, sleep soundly through the night, but wake in the morning with pain/stiffness. Lower back usually. That’s when I sleep on my back, which is my usual sleeping position. If I sleep on my side, same thing, but also numbness in the hip. This is all so strange to me because I am coming from an extremely firm, bargain basement Ikea HAUGESUND which I have had two of over the last five years. They are quite firm mattresses with almost no comfort layer to speak and wear out after two years each, but I never had any back pain or numbness sleeping on them, compared to the Allswell. On those mattresses, I liked to sleep on my back, with a mountain of pillows pushing me into an almost sitting position. I have tried to replicate that on the new mattress as well, with pain resulting. I have also tried just one small pillow, and pain results as well. I also slept fine on the old mattresses on my side with no numbness. Honestly, I would have gotten another one, but my girlfriend is a side sleeper, and wants something softer, and I want something that doesn’t wear out every two years.
My body type is that of someone who (according to most on the internet – maybe not necessarily true) would typically benefit from a softer mattress, and doesn’t require any special support measures: I am 5 11’ and 130 lbs. What I am trying to figure out now is how to diagnose the problem. If I move on from the Allswell, what should I look for in a replacement? Do I need a mattress that is softer? Firmer? More supportive? Thicker comfort layer? Thinner comfort layer? My current theory is that because I am light and tall, when I am on my back, my whole body is being supported by the comfort layer, which I sink into and it doesn’t support my lumbar spine. And the support springs are quite firm, so when go on my side and I do sink in with my hip, I get the numbness. So what I need would be either a mattress with a firmer/thinner top layer, and a less firm support layer. Does that make sense? Are there any good way I can figure this out?
Two other miscellaneous points. I have just moved to a new place with lots of new things, so am doing lots of sitting all day at a new desk and new desk chair. Is there any good way to separate the origin of back pain from desk/chair from mattress? Second, my girlfriend has a casper original bought in 2019 and I had similar feelings to this when I moved in with her for about a month (morning lower back stiffness) in my first week sleeping on it. But less severe. And, after about a few weeks I got used to it and did not have pain, mostly by sleeping on my side. But I always felt like it was a little too soft for back sleeping and I slept more on my side than I usually did on the Ikea one.