The phrase 'twinkle twinkle' is part of the opening line of the famous nursery rhyme 'Twinkle, Twinkle, Little Star', which is based on the poem 'The Star' by Jane Taylor. This nursery rhyme is a simple and endearing piece often used to soothe children. The repetition of 'twinkle' mimics the sparkling effect of stars in the night sky, capturing the wonder and curiosity of observing the stars. The poem's simplicity and melodic quality make it a timeless piece of children's literature, often associated with bedtime routines.