The Human Reaction Is There

i just wonder about that first moment when you realize, i'm actually in space. Is that something that the mind is readily able to process? I mean, i know you've trained for a you've rehearsed at ad infinitum for years and years and years. But none the less, is there still an aspect of it which takes some aclimatizing to. It sounds, though, that was kind of tiring and alarming just to listen to, never mind experience.