The use of grossly overstated language to emphasize a characteristic of something or someone is called

Hyperbole.

Explanation:

A hyperbole is a figure of speech that involves an exaggeration of ideas for the sake of emphasis. The type of language when using a hyperbole is overstated, and it tends to exaggerate a description about something or someone.

For example:

That bald spot on your head is brighter than the sun.

The bald head of the individual cannot possibly reflect such an intense level of light, but it is said so with the objective of emphasizing on its relatively intense brightness.

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long  

“asleep in his bed” is personified.