It's the first few lines of "A Million Dreams" from The Greatest Showman.
'"..... every night I lie in bed
The brightest colours fill my head
A million dreams are keeping me awake
I think of what the world could be"
I also have both Iris and Bertie singing their own versions of the song on my phone to listen to whenever I want to fill my heart with joy ......... pure magic, what more could any woman need!