Apartment pool

[mlund]

I really like your idea for this, laying awake and watching the playing of light on the walls from the water. 

By the window,
a child wakes from the light.
Stirring on his mattress,
he watches the walls of his room
live & die I am sort of confused by the relevance of these lines. What does living and dying have to do with reflections of light on the walls?
live & die
from the strange electric glow,
still dancing in rhythm I really like this line, it implies that this act of lying awake in the night has happened before, and that the lights on his wall are almost a comfort for him in a seemingly chaotic or terrifying world.
to the hiss of the city night.

I am not really sure about your use of commas to separate lines. A comma normally implies and pause in flow or thought, but where you have placed them sort of breaks the natural rhythm and meaning of where I think you are trying to go.