Much like humans, plants have an internal clock. After all, you’ll notice that your body automatically wakes up in the morning and gets tired during the day, encouraging you to rest. Maintaining this rhythm (known as the circadian rhythm) is key to ensuring our bodies function properly.
For plants, following a strict rhythm is just as important. First and foremost, plants use this internal clock in order to regulate their energy levels and metabolism to ensure they can make it through the night. However, plants also use their internal clock to detect what time of year it is and when to flower.
For cannabis plants, this rhythm becomes extremely important during the
flowering cycle. Disruptions to a plant’s dark period can stress the plant and can actually reverse it back into the vegetative state or worse.
Alternatively, light stress can also lead to hermaphroditism. Female cannabis plants can develop male traits in order to pollinate their own flowers if they see that the conditions might be too difficult to flower in.
Just came up with that now, didn't copy paste at all.