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 (as well as of all my Sciblings – go around the blogs today to see them) 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.
My HomepageMy homepage is at http://coturnix.org. It is temporarily stripped to minimal information, but more will come soon.
Search This Blog:
There are no public comments available to display.
- Food goes through a rabbit twice. Think what that means!
- BIO101 - Physiology: Regulation and Control
- Morning at Triton
- Everything You Always Wanted To Know About Sleep (But Were Too Afraid To Ask)
- BIO101 - Current Biological Diversity
- City Of Light: Insomniac Urban Animals
- Science Blogging Networks: What, Why and How
- BIO101 - Protein Synthesis: Transcription and Translation
- BIO101: Cell-Cell Interactions
- When quotes matter: impact of outside quotes in a science press release on news judgment jcom.sissa.it/archive/13/04/… 1 hour ago
- RT @ccziv: Via @nprnews: When Nonprofit Hospitals Sue Their Poorest Patients n.pr/1ACsGiZ 23 hours ago
- The Microbes in Your Kitchen (Or in your Starbucks mocha) blogs.scientificamerican.com/food-matters/2… 1 day ago
- When to quit your journalism job pressthink.org/2014/12/when-t… 2 days ago
- Why the workday should be 10–6, not 9–5 vox.com/2014/12/17/740… 3 days ago
- Making the Internet a utility—what’s the worst that could happen? arstechnica.com/business/2014/… 3 days ago
- Questions about alternative splicing sandwalk.blogspot.com/2014/12/questi… 3 days ago
- Beyond journalism in the present tense nie.mn/1z6rojp via @NiemanLab 3 days ago
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.