Is anyone else scared of suffocating the baby when bf lying down?

[flubdub]

In the night when I bf ds2, my boob (Im a C cup) seems to smother his face
I always end up pressing my boob down where his nose is, just so he can breathe, but Iv read you shouldnt do this, as you may end up a bit blocked.
Iv tried angling him in all sorts of ways, but its always the same. Funnily enough though,its not a problem on the right one.

Don't worry - if he can't breath he'll let go of your nipple!

Baby's noses are shaped the way thy are so that they can have a big boobie covering their faces and still breath.....