The meaning of a day

What does a day mean in someone's life?
Is it the in and out of the sun from his window
Or the time between when she shuts and opens her eyes
Is it after he cleans his teeth and washes his body
To sit on a desk with a pile of files
Or is it the little moments
That mark the beginning and end of a day
A stolen glance
A stranger's smile
A child's laugh
A cup of coffee with droplets on the rim
A gaze into nothingness
A gentle breeze on a hot summer's evening
Looking at the city lights
Does the day begin when you come back home to hot brewing tea
And take a deep sigh
Floating with the waves of the sea
A tear escaped but quickly wiped away
A long goodbye
A starry sky
Falling asleep with a book on the chest
Him covering her with a duvet
A lingering gaze
Sunday's laze