Most animals placed under unnatural illumination have more difficulty sleeping thanks to decreased production of

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Melatonin is a hormone that regulates sleep patterns and is produced in greater quantities in the dark. Unnatural illumination can disrupt this process, leading to decreased production of melatonin and difficulty sleeping. Leptin is a hormone involved in regulating appetite and metabolism, cortisol is a stress hormone, and free radicals are unstable molecules that can damage cells. While these factors may also be affected by unnatural illumination, melatonin is the most directly linked to sleep patterns.

Most Animals Placed Under Unnatural Illumination Have More Difficulty Sleeping