I find it funny that these type of excuses as to why Face ID isn't working for the OP is really reaching.
excuses?
this is new technology.. we don't know how sensitive the thing is or what exactly it's reading..
if your eyes are puffy, it might not recognize you.. is that right? or wrong?
again, we don't know. (well, apparently
you know

)
and through various scenarios of this happening and various people realizing certain things when the phone won't unlock, we'll learn more about it.
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why be so
(whatever it is you're being)?
i mean, you're seemingly saying this:
Why Are Eyes Sometimes Puffier in the Morning After You Wake Up?
While we sleep, we don't blink. And this is part of the reason why eye puffiness develops.
Dark circles can form under the eyes from stress or lack of sleep.
Blinking for eyelids is like walking for legs. When idle, some people develop swelling in their lower extremities that goes away as soon as they start walking and muscles in the legs begin "milking" the trapped fluids (edema), which are released back into circulation.
A similar action takes place in the eyelids. The closed, non-blinking eyelids during sleep potentially can swell in certain people prone to this problem. So in the mornings, you could wake up with unusually puffy, swollen eyelids. As soon as you open your eyes and blinking begins, some of this swelling can diminish in an hour or so.
...has no effect on faceID.
ok then. how are you so sure?
.