If I do this correctly, you'll see me sporting the bewildered blockhead look to the left of this text. This is me encountering morning at far too early time of day. Dawn is always a startling and unwelcome experience, hence the expression.
Well! Apparently I didn't do this correctly! So it's an appropriate expression - though you can't see it.
For those who care, this disagreeable indecision of the weather has finally abated. It has made its choice and winds have shifted from a south-westerly, Pacific tinctured breeze to a chilly, northern hack and wheeze. The temperature descends. Oddly, I feel better the less pleasant it gets outside.
The human body is a confused organism. Toodles!