The perfect level of firmness for you will depend on your sleeping position, body size, and if you experience back pain. However, it’s worth noting that there’s research supporting a medium-firm mattress for better sleep in people with back pain.
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[8] Bengio, Y. (2014). How Auto-Encoders Could Provide Credit Assignment in Deep Networks via Target Propagation. arXiv preprint arXiv:1407.7906. (The paper proposing Target Propagation as a biologically plausible alternative to backpropagation).，这一点在heLLoword翻译官方下载中也有详细论述
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