What is the importance of sleep?

Japan has the highest level of sleep deprivation among developed countries. Two-thirds of Japanese adults do not get the recommended 7 to 8 hours of sleep. The average sleep time for adult Japanese is 6.5 hours, and 40% sleep less than 6 hours.

"I feel a bit tired, but it's probably nothing serious." This is precisely the problem!

Why do we sleep?

Scientific research on sleep is actively progressing, and the results are very interesting. Consistently getting healthy sleep is the most important lifestyle habit one can choose for a healthy and happy life. Sleep is even more important than eating healthy and exercising.

Recovery

Rest the body, heal and repair cells.
Regulates the balance of important hormones such as ghrelin (hunger), leptin (appetite suppression), insulin (blood sugar reduction), cortisol (stress), melatonin (sleep cycle), and growth hormone.
Sleep deprivation increases the risk of heart disease, stroke, diabetes, kidney disease, depression, and weight gain.

Memory Consolidation

Organization of long-term memory and learning acquisition.
Up to 30% improvement in memory, improved learning ability, and enhanced muscle memory.
Sleep deprivation leads to decreased memory and learning ability.

Weight Management

Waste products are processed during deep sleep.
Removes toxins (cancer cells, beta-amyloid protein causing Alzheimer's, and other cells).
Sleep deprivation increases the risk of cancer, diabetes, arthritis, weakened immune system, and premature aging.

Brain Reorganization

Synapses are formed during sleep, and newly formed synapses improve performance for athletes/students/workers, enhance attention and creativity, and increase productivity.
Connects new memories with existing ones.
Sleep deprivation hinders decision-making and problem-solving, and increases the risk of emotional dysregulation and accidents.

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References:

1. Why Sleep Matters: Quantifying the Economic Costs of Insufficient Sleep, RAND Corporation
2. Why We Sleep, Matthew Walker

Written by FujihashiMasayuki

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