She is Firestar's (current leader in Thuderclan) mate.
they sleep in a den.
Yes. Firestar started noticing Sandstorm around Rising Storm. An experience that made them connect was when Firestar saved Sandstorm from falling over the gorge. (when Firestar was Fireheart and Sandstorm was Sandpaw). After that, they couldn't stop looking at each other! In The Darkest Hour, they both admit that they love each other and Sandstorm goes to sleep with Firestar in his den when the battle with BloodClan was going on. After that, in the end of Firestar's quest, they have 2 kits named Squirrelkit (later Squirrelflight) and Leafkit (later Leafpool, med cat).
in a den
In their den
A red fox sleeps in a den for safety and shelter.
Bobcats mostly sleep in their homes.
genarally but it is mostly a myth.
none of them giraffes sleep standing or curled under a tree or other place
Cub Masters and Assistant Cub Masters. There are also Den Leaders, who lead smaller groups of Cub Scouts within the pack, which is referred to as a den.
The Grey Wolf can sleep almost anywhere, anytime. But perfer sleeping in a den. They usualy sleep after a hunt
The animal crawls into a den and goes into a deep sleep. firs of all it is Hibirnate. then, they go to sleep in winter
It is the rock at the center of Thunderclans forest camp where leaders call clan meetings and make announcements. The leaders den is underneath it.