Iambic Pentameter

is 5 unstressed syllables followed by 5 stressed syllables per line, used by playwrights like Shakespeare because it resembles the rhythms of speech, and it lends itself to memory, unrhymed it is called Blank Verse, but when it follows a pattern of rhyme consisting of fourteen lines, it becomes a sonnet. Look for it here:

Schoolboys in Winter by John Clare

Hibernate by S.M.(M).L.

Winter wraps itself around us with flakes.
Soon we are settled in drifts, beside fires,
snuggled deep into down, books read pile up,
and the frost creeps up from the pane's corners.
Outside the trees are still and sun glitters
in  the many prisms of ice.  Venture
out, find lakes' shores treacherously lengthened.  
Shiver in our scarves and mittens, tremble
our deep sighs of breath come in bursts of white;
back inside, fingers and toes tingle and
warm drinks steam.  Soon enough we start to yawn
and slip back into slumber like the trees
and lake and soil as they patiently wait.  
What comes next will come, whether we sleep or wake.