Not at all. I was thinking the same, but then later on in the flight I changed my mind a bit. I think it has something to do with how the seat is adjusted.

Whatever the case, Virgin Atlantic's Upper Class design states that the firmness of seat/mattress for sitting/sleeping is different, and that one type cannot do both. That is why their seats 'flip over' with a softer surface for sitting and a firmer one as a mattress for sleeping. It works very well indeed. I think that there is one airline which has firm mattresses which fit on top of the First Class seats to solve the problem, but I cannot remember which airline it is.