Humans have evolved to sleep when it’s dark and be awake when it’s light. Species vary in when they sleep, with some creatures sleeping at night and others in the day. I don’t think anyone has properly worked out why, but one factor could be which of our predators or big threats are around at certain times.
Thank you for reading this article. Please note that while we share a lot of awesome information and research you should be aware our articles are strictly for informational purposes and do not constitute medical advice intended to diagnose, cure, treat or prevent any disease.