
I'd call it a
"Fortress of Solitude for babies."
The Big Bang Theory Season 10, Episode 6

...I will be enjoying a blissful evening
in my personal Fortress of Solitude.
The Big Bang Theory Season 2, Episode 21

in the SOLITUDE of a cold cell.
Game of Thrones Season 7, Episode 6

...all my other SOLITUDE.
The Big Bang Theory Season 8, Episode 7

The king snores, perhaps?
Or simply prefers SOLITUDE?
Game of Thrones Season 2, Episode 4