Climbing Up The Walls (Zero 7 Mix) lyrics

I am the key to the lock in your house
that keeps your toys in the basement,
and if you get too far inside
you'll only see my reflection.
See her face when she sleeps tonight,
I am the pick in the ice,
do not cry out or hit the alarm,
we are we're friends till we die.
And either way you turn I'll be there,
open up your skull, I'll be there
climbing up the walls.
It's always best when the light is off,
it's always better on the outside,
in the crack of your wanting smile,
fifteen blows to the skull.
So tuck the kids in safe tonight,
and shut the eyes in the cupboard.
do not cry out or hit the alarm,
you'll get the loneliest feeling
that either way you turn I'll be there,
open up your skull, I'll be there
climbing up the walls.
Climbing up the walls.
Climbing up the walls

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What do you think is the meaning of Climbing Up The Walls (Zero 7 Mix) by Radiohead?