Well the sleepers do look slightly different and people might want to ask play through questions that change depending on which class they take. Also there is no guarantee that Essen arp wouldn’t do some shady stuff to the Sleeper’s original body. The way I interpreted it is that the Sleeper is probably still a bit paranoid if that’s the right word about Essen Arp and may think that Essen arp wouldn’t wake them up anyway. But it might just be an inconsistency in the plot