The Cake Aisle of Pak'nSave

I will arise and go now
and go to Pak'nSave,
and a carpark find there
close by and in the shade.
Nine muffins will I buy there
a brush for the lavatory,
then read alone when lunch I've made.
...
I will arise and go now
for always night and day
I hear the checkouts ringing,
trolleys swinging to the door.
While standing in the kitchen
or at the window grey,
I hear it in the dim head's core.