Staring at the blue sky causes insomnia to occur in the human

O sleep, O gentle sleep, Nature's soft nurse, how have I frightened thee. That thou no more will weigh my eyelids down, And steep my senses in forgetfulness?

I routinely use my blue sky "Device" and it works very well for me.

The world is so depressing which is why the sky is usually blue.

The sky, the sky beyond the door is blue.

The sky is blue so we know where to stop mowing.