Between Night and Day

[YaMarVa]

the crickets chirp
while the birds awake
and begin their songs,
the one unaware of the other
the train whistle blows,
the birds oblivious
of the persistent darkness
the crickets unknowing
of the impending light,
like smoke gently rising
from soft-glowing, ancient embers
my mind returns to you

Overall, good poem as I have no critiques on your grammar or method beyond thinking you need some capitalization. You have some good imagery.
"like smoke gently rising
from soft-glowing, ancient embers
my mind returns to you" - good line!

But I cannot connect to the content as I would think birds and crickets (nature) are much more aware of the coming morning and the cycle of the natural day, as it is we humans whom are further oblivious as we need clocks and calendars to gauge our days.
"the birds oblivious
of the persistent darkness
the crickets unknowing
of the impending light"
Maybe these crickets and bird are, as you the writer created them as you please, but I am hesitant (as a naturalist, and apparently a realist) that in nature they are.
I would consider another metaphor more fitting to an awakening.