A man dressed in a surfing shirt and blue and white shorts skillfully guides his yellow board with its multicolored sail over the crest of an ocean wave, flipping over in the process.
a man sleeps in bed
A sleeping man doesn't guide a board.
The man cannot be sleeping if he is guiding his yellow board.  The man cannot be at the ocean if he is in bed.
A man who guides his board over the crest of an ocean wave, flipping over in the process cannot be sleeping in bed at the same time.