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Botanically, no. Sunflowers are day-blooming dicots. Their flower heads are actually thousands of tiny florets that open in response to blue light wavelengths. However, evening-blooming sunflowers do exist as rare cultivars (e.g., Helianthus annuus ‘Velvet Queen’ opens later in the day). And under continuous artificial light, a sunflower can be tricked into any cycle.

In nature, sunflowers are defined by heliotropism—the act of following the sun. A sunflower blooming at night is a biological impossibility, making it a potent symbol for something that thrives in conditions where it is expected to fail or remain dormant. The Symbolism of the "Night-Blooming Sunflower" himawari wa yoru ni saku

: Hisato is forced to take a position as the president's private secretary to absorb her husband's professional liability. Botanically, no

Himawari wa Yoru ni Saku (translated as "Sunflowers Bloom at Night" ) is a dramatic adult manga and anime series written by and illustrated by Hiromitsu Takeda A sunflower blooming at night is a biological

A valid point. The phrase is not a prescription for permanent night. It is a survival tool for temporary darkness. No one should live entirely without sun.