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Our sleep and wake patterns

On its own, the circadian rhythm takes almost 24 hours. Our bodies rely on the Sun to reset this cycle and keep it at 24 hours, the length of our days. Light and the dark are important signals for the cycle.

During the night, body temperature drops, metabolism slows, and the hormone melatonin rises dramatically. When the Sun comes up in the morning, melatonin has already started falling, and you wake up.

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Our bodies in the dark

During the dark, levels of the hormone leptin (hunger control), go up. This means we do not feel hungry while low levels make us hungry.

Ans research found that sleep disruption and turning on lights lowers leptin levels which makes people hungry in the middle of the night.

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Not all light is the same

Some kinds of light make you more alert and more awake, and others have less of an effect:

  • Sunlight is strong in blue, short-wavelength light, although it includes all other colors as well. That’s important in the morning when we need to be alert and awake.
  • Your tablet, pho...

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Electricity changed the way we sleep

  • Before electricity, people experienced bright, full-spectrum days of sunlight and dark nights. We slept in a different way than we do now.
  • Everything changed when electric lighting was invented in the latter part of the 19th century. Since then there has been an ever-increasing ass...

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Your body needs dark too

Your body needs dark too

While we are starting to pay attention to how important sleep is, the need for dark is still mostly ignored.

Being exposed to regular patterns of light and dark regulates our circadian rhythm. Disruption of this rhythm may increase the risk of developing some health conditions includin...

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mar_b

Technology helps but it doesn't solve everything. I want to understand my own body.

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The Circadian Rhythm

The Circadian Rhythm

It is impacted by three main factors:

  • Light: probably the most significant pace setter of the circadian rhythm. Staring into a bright light for 30 minutes or so can often reset your circadian rhythm regardless of what time of day it is.
  • The time of day

2. Melatonin

  • Natural hormone that regulates your body’s circadian rhythm or sleep-wake cycle. Levels of the hormone increase in the evening when it’s dark to promote sleep & decrease in the morning when it’s light to promote wakefulness.
  • Getting adequate ...

It matters when you sleep

Our bodies are synchronized with the day-night cycle as our planet rotates. Our circadian rhythms continue even in the absence of any external input. Even plants that are kept in a dark cupboard at a stable temperature open and close their leaves as though they can sense the sun.

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