I'd call it a
"Fortress of Solitude for babies."
The Big Bang Theory Season 10, Episode 6
in the SOLITUDE of a cold cell.
Game of Thrones Season 7, Episode 6
The king snores, perhaps?
Or simply prefers SOLITUDE?
Game of Thrones Season 2, Episode 4
Welcome to my fortress of SOLITUDE.
The Big Bang Theory Season 8, Episode 7
...I will be enjoying a blissful evening
in my personal Fortress of Solitude.
The Big Bang Theory Season 2, Episode 21