SO fiddle
Test Fiddle mainly for SO Questions
by Nick Craver
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div class="nights">
<h5 class="biguns">
<div class="num">4</div>
Nights
</h5>
</div>
JavaScript
alert($("div.nights h5 div.num").text());
alert($("div.nights > h5 > div.num").text());
alert($("div.num").text());