Saturday 1 August 2009

Hormones and sleep.

Deep sleep triggers more release of growth hormone, which fuels growth in children and boosts muscle mass and the repair of cells and tissues in children and adults.
Sleep’s effect on the release of sex hormones also encourages puberty and fertility. Consequently, women who work at night and tend to lack sleep are, therefore, more likely to have trouble conceiving or to miscarry.

During sleep, your body creates more cytokines cellular hormones that help the immune system fight various infections. Lack of sleep can reduce the ability to fight off common infections.
Research also reveals that a lack of sleep can reduce the body’s response to the flu vaccine. For example, sleep-deprived volunteers given the flu vaccine produced less than half as many flu antibodies as those who were well rested and given the same vaccine.

When we sleep less, our stomach secretes more of an appetite stimulating hormone, and we produce less of the hormone which reduces our desire for food consequently we gain weight. A recent French study of 1,138 children found that 26% of children in the sample who had a sleep deficit were overweight, and 7.4% were obese. Day time naps do not compensate for proper night sleep which is generally deeper and longer. This same study showed that 22% of children who slept less than 10 hours a night when they were only 2.5 years old were hyperactive at 6 years of age. This is twice the rate of those who slept 10-11 hours a night at 2.5 years of age.

Sleep is undeniably an important part of our daily lives. Sleep deficit has profound effects not just on our mental health but also on our physical health.

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