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What the body does during sleep is quite different. During sleep your muscles relax and the body fills them with blood and hormones that trigger tissue repair and growth. Sleep is part of the body's repair process. When you're just sitting none of that happens.

Sounds a lot like "if water is good why is coke bad ?"

Just look at the average desk worker posture and it'll tell you more than half of the story already, it's bad for your back, it's bad for your neck, it's bad for you hips, it's bad for breathing, it's bad for blood circulation, it's bad for lymph circulation, &c.

Then there is the fact that you cannot survive without sleep, if you were to spend another 8 hours in bed you'd likely develop bed sores and all kind of nasty things

Sleeping for too long causes lots of problems, right? I thought that was part of why they paid people to do rest studies, to monitor muscle atrophy from lying down 12 hours a day or similar.

Lying in bed all day causes sores and severe muscle atrophy.

Humans have not evolved from sitting. Ask your hip flexors.