Are zombies active at night?

They are not nocturnal, they are arrhythmic! And insomniac. They never sleep! Remember how one becomes a zombie in the first place?

blogs.scientificamerican.com - Are Zombies nocturnal? - Scientific American Blog Network

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For Halloween, I thought I'd republish this old post of mine from July 1, 2010. Blame 'Night of the Living Dead' for this, but many people mistakenly think that zombies are nocturnal, going around their business of walking around town with stilted gaits, looking for people whose brains they can eat, only at night.

You think you are safe during the day? You are dangerously wrong!

Zombies are on the prowl at all times of day and night! They are not nocturnal, they are arrhythmic! And insomniac. They never sleep! Remember how one becomes a zombie in the first place? Through death, or Intercision, or, since this is a science blog and we need to explain this scientifically, through the effects of tetrodotoxin. In any case, the process incurs some permanent brain damage.

One of the brain centers that is thus permanently damaged is the circadian clock. But importantly, it is not just not ticking any more, it is in a permanent "day" state. What does that mean practically?

When the clock is in its "day" phase, it is very difficult to fall asleep. Thus insomnia. When the clock is in its "day" phase, metabolism is high (higher than at night), thus zombies require a lot of energy all the time and quickly burn through all of it. Thus constant hunger for high-calory foods, like brains. Insomnia, in turn, affects some hormones, like ghrelin and leptin, which control appetite. If you have a sleepless night or chronic insomnia, you also tend to eat more at night. But at night the digestive function is high. As zombies' clock is in the day state, their digestion is not as efficient. They have huge appetite, they eat a lot, but they do not digest it well, and what they digest they immediately burn. Which explains why they tend not to get fat, while living humans with insomnia do. Finally, they have problems with wounds, you may have noticed. Healing of wounds requires growth hormone. But growth hormone is secreted only during sleep (actually, during slow sleep phases) and is likewise affected by ghrelin. In short, a lot of the zombies' physiology and behavior can be traced back to their loss of circadian function and having their clock being in a permanent "day" state. But the real take-home message of this is.... don't let your guard down during the day! Picture of me as a Zombie drawn by Joseph Hewitt of Ataraxia Theatre whose latest project, GearHead RPG, is a sci-fi rogue-like game with giant robots and a random story generator - check it out.

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What animals can become zombies?

While predominantly a fictional concept when applied to larger mammals, there have been instances of insects, such as ants and wasps, becoming "zombies" from a real world perspective. For example, the Cordyceps fungus is known to infect insects and change their behavior before their eventual death.

en.wikipedia.org - Zombie animal - Wikipedia

"Zombie dog" redirects here. For the album, see Scapegoat (band)

A zombie animal is an animal that becomes a zombie as depicted in the zombie fiction genre. Numerous types of animals have been portrayed as zombies - a zombie dog appeared in The Last Man on Earth in 1964,[1] and an infected dog is the source of the zombie virus in REC (2007). Night of the Zombies (1984) features a scare from a zombie cat,[2] as does Scouts Guide to the Zombie Apocalypse. A jump scare scene featuring zombie dogs in the first Resident Evil is considered to be a seminal horror scene in video game history.[3][4][5] While predominantly a fictional concept when applied to larger mammals, there have been instances of insects, such as ants and wasps, becoming "zombies" from a real world perspective. For example, the Cordyceps fungus is known to infect insects and change their behavior before their eventual death.