Venn diagram

I have lost you to sleep again
Sleeping as we do on opposite sides of a venn diagram
I read the time in shadows on the wall
The shards of light
Through the slats on your window

I ease myself from under your languid arm
I fumble on my boots and hear you breathe through your alarm
I disarm it for you, you rarely hear it anyway
I wouldn't want it to intrude upon your dream
School bell ring messing up the play

A note, penned clumsily in this century's type-ruined hand
Saying gone down the shops for a walk I'll bring back some sandwiches
And then I kiss your face
The black and the blue
I tie it into my laces, I don't want the wander blocking up the view

I stumble out into the afternoon
Still salty from drink and the late night pool
I'll be gone an hour at most
And you will be more diagonal
And I've a head on me in the post, I know, a castle swallowed in the swell