Sleep.

Why Sleep Is So Important

Most people know sleep is important, but few understand what happens while we sleep.

According to many research articles and sleep specialists, our body gradually switches from using glycogen and sugar for energy to burning fats — FFA (free fatty acids). During this restorative window it repairs cells, produces metabolic water, and recalibrates physiological systems to prepare your body for the demands of the next day. Crucially, several common habits and lifestyle choices can interfere with this natural process and reduce its restorative benefits.

Here are some aspects to consider:

1. Go to bed on an empty stomach

Try to stop eating 3–4 hours before bedtime.

When you stop eating, your body gradually uses up its sugar stores and begins burning fat. The author believes this allows your body to perform its overnight repair processes more effectively.

2. Listen to your body's sleep signals

Yawning is your body's way of telling you it's ready for sleep.

Instead of pushing through tiredness by watching TV or using your phone, go to bed when you begin yawning.

3. Don't overdrink water

Drink when you're thirsty, but avoid forcing yourself to drink excessive amounts, especially in the evening.

Too much water before bed can disrupt sleep by causing you to wake up during the night.

4. Keep a regular bedtime

Your body works best with a consistent routine.

Going to bed and waking up at roughly the same time every day helps regulate your internal body clock and often improves sleep quality more than simply aiming for eight hours.

5. Have a wind-down routine

Spend the last hour before bed relaxing.

Good habits include:

Reading a book
Avoiding phones, computers and television
Staying away from work emails and social media

This gives your brain time to slow down before sleep.

6. Get outside soon after waking

Spend about 20 minutes outdoors within 30–60 minutes of waking up, even if it's cloudy.

Morning light helps set your body's internal clock, making it easier to fall asleep the following night.

The "3–1 Rule"
Stop eating 3 hours before bed.
Stop using screens 1 hour before bed.
Then let your body prepare naturally for sleep.
The main message

The author believes that good sleep is less about finding the perfect mattress or supplement and more about working with your body's natural rhythms by:

eating earlier,
following a regular sleep schedule,
avoiding screens before bed,
getting morning light,
drinking according to thirst,
and paying attention to signs of tiredness.
Important note

Many of these recommendations—such as maintaining a regular bedtime, reducing screen use before bed, avoiding large late meals, and getting morning light—are well supported by sleep research. However, the article's central claim that these benefits are mainly due to "deuterium depletion" is not widely accepted in mainstream sleep science and remains a hypothesis promoted by a small number of researchers.