as u can tell this skin is rather unusual so here's an explanation of the different elements this skin is made of:

-moon and stars: represents the night (when you sleep)

-the red "cape": represents a bed sheet (where you sleep)

-the blue sky with clouds: presents a common type of dream: flying

-the butterflies: symbolises positive dreams

-the red eyes: symbolise nightmares

-the drawers: represent one of the main purposes which is to sort and filter memories

-the mask: i was a bit inspired by one of the cards of a card game i like called Dixit additonally that mask could be interpreted as a symbol for fiction, its eyes are also closed

(by the way, despite this skin being for the dream element and the presence of a mask, it isn't a Dream reference)