Like nights in a papercup, when you wanted it to last

hi!

I'm a finnish student girl and i'm asking meaning for a funny sentence from a song "papercup" performed by Heather Nova. So what does she mean by saying
" like nights in a papercup, when you wanted it to last"?

Thank you all!

I found the lyrics, in case anyone wants context:
Paper Cup

Wishful thinking I might be yours
Drifting on every step
I'm always drawn to the dark horse
Sweet sweet nothing's said

And every dream is just a dream, after all
And everything stands so still when you dance
Everything spins so fast
And the night's in a paper cup
When you want it to last

Wishful thinking you might be mine
Every shiver sends
One breath under the bridge of sighs
Bending where the river bends

And every dream is just a dream, after all
And everything stands so still when you dance
Everything spins so fast
And the night's in a paper cup
When you want it to last

And every dream is just a dream, after all
And everything stands so still when you dance
Everything spins so fast
And the night's in a paper cup
When you want it to last

And everything stands so still when you dance
Everything spins so fast
And the night's in a paper cup
And you want it to last

I'll leave the meaning up to those who think it meaningful....

Compared to some things I've read in the paper, this is meaningful. A paper cup is something temporary, something not expected to last, something with an ephemeral life. Tonight's pleasure might as well be in a paper cup, something that can't last. I suppose if it were in a glass tumbler or a crystal goblet it might last longer. At least the container would. SS