Juliet uses many metaphors and allusions. A metaphor compares two unlike things, and an allusion makes reference to history or literature. The beginning is both. She begins by asking Phaeton’s carriage to bring in night. She describes how lovers do not need light to see, because they light each other up. She also describes night as a matron, a motherly old lady.
Come, civil night,
Thou sober-suited matron, all in black,
And learn me how to lose a winning match,
Play'd for a pair of stainless maidenhoods.
She is describing how she wants to lose her virginity, now that she is married. For Juliet, night is a metaphor for sex as well as love. Night brings Romeo, and she loves him.
Juliet also describes Romeo as “day in night” because he is the bright spot of her otherwise dark situation.
In an allusion to Romeo’s earlier reference to Juliet begin the sun killing the envious moon, Juliet describing making stars out of Romeo.
Give me my Romeo; and, when he shall die,
Take him and cut him out in little stars,
And he will make the face of heaven so fine
That all the world will be in love with night(25)
And pay no worship to the garish sun.
The day is "tedious," because Juliet cannot wait for night to come and Romeo with it.
There is also a simile, which compares two things indirectly:
So tedious is this day
As is the night before some festival(30)
To an impatient child that hath new robes
And may not wear them.
All of these references use flowery language because Juliet is excited and in love. Her soliloquy is suitably over the top to describe her passionate, and even aggressive, feelings.