I don't think you have anything to worry about.
I have two cats that tend to sleep with me, there will be cat hair on your bed, and cats seem to have the amazing ability of booting you out of bed because despite their small size they seem to somehow take up half the bed, other than that they're fine.
I was very worried at first about us squishing them or the cats harming us.
One of my cats likes to lay on top of us but she's very small and doesn't go near our head so she's fine, she does get the occasional gentle kick because my legs sometimes spasm in the night or when I wake up and don't realise straight away that she's the big heavy lump on my feet or on the bottom of the bed taking up all the room - she gives me a dirty look, but she's never been hurt. The tom has been a bit of a pest, when he wants attention he will stand on us in more uncomfortable and harmful ways, for example he used to stand on my throat, or would often stretch so his paws (and claws) were in my face - but I'm still here, and he doesn't do this much any more.
When they want attention they may stand on you or put their paws near your face, but only if you let them as they will quickly learn not to do this if you keep moving them or telling them a firm 'no', but when you're asleep they know this so get on with sleeping, playing, eating, whatever rather than trying to get attention from you by standing on you etc. If you move to potentially lay on top of them then they will move - you'd have to be a large person and literally jump on them when they're not expecting it to be able to harm a cat when in bed.
_________________
Bloodheart
Good-looking girls break hearts, and goodhearted girls mend them.