Normal? Hmmm....
As a novice myself, I suspect this behavior is more common with climbing/non-burrowing roaches. Unless you observe them 24/7 it can be difficult to determine what is normal and what is not. I was fooled the other day when I noticed this one roach was spending a lot of time (4+ hours) sitting in that vertical position and then discovered it was just the shell of a recent molt. A few hours later it disappeared, having been eaten.
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Or maybe it's a yoga type thing, letting the juices flow into their little brains. The behavior of roaches does not seem to be bound by convention.