Do zombies have to sleep?

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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Can humans survive on one meal a day?

For most people, there are no serious dangers involved in eating one meal a day, other than the discomforts of feeling hungry. That said, there are some risks for people with cardiovascular disease or diabetes. Eating one meal a day can increase your blood pressure and cholesterol.

webmd.com - Is Eating One Meal a Day Safe? - WebMD

The “One Meal a Day” diet, or OMAD diet, claims to help you lose weight by forcing your body to burn fat. It’s a type of intermittent fasting, which alternates between periods throughout the day in which you can eat anything and periods in which you don’t eat at all. OMAD is particularly strict because you don’t eat for 23 hours, then consume all of your calories in a single meal. How It Works Like other kinds of intermittent fasting, eating one meal a day is a way of manipulating how your body finds and uses fuel. When you eat in a more traditional pattern, your energy comes from the food that you eat. When you take in carbohydrates, your body breaks them down into sugars. If you have more sugar in your blood than you need, a chemical called insulin will carry the extra into your fat cells. When you don’t eat for extended periods of time, your body produces less insulin. Your cells still need energy for fuel, so your fat cells release energy to compensate. For this to happen, however, you have to avoid eating for long enough that your insulin levels drop.

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