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Sleepy cows give sleeping milk

15.12.2015

Milk milked at night helps against insomnia and obsessive anxiety. Korean researchers compared the behavior of rats fed day milk with those fed night milk. It has been found that night milk has a great calming, sedative effect, that after it the animals sleep longer and are less prone to physical activity.

On the other hand, being awake, they explore new territories more actively, which indicates reduced anxiety - roughly speaking, after nightly milk, the rats began to be less afraid. The effect was the same as after diazepam, a well-known sedative and hypnotic drug. (At the same time, milk was given after processing: it was first turned into a powder form, and then the milk powder was diluted with water.)

Day milk can also work as a relaxing agent, but to a lesser extent than night milk. For example, when rats fed day or night milk, or a solution of diazepam, or just water, were placed on a rotating drum and the activity and coordination of movements of rodents were observed, then after night milk rats fell off the drum twice as often as after day milk. (In turn, after diazepam, animals fell off the device twice as often as after night milk.)

A comparative biochemical analysis showed that night milk contains 24% more amino acid tryptophan, which stimulates sleep, and 10 times more of the hormone melatonin, which regulates circadian rhythms, compared to day milk. Obviously, the sleepy state of cows also affects the composition of the milk that they produce at night. On the other hand, according to electroencephalography, there was nothing unusual in the rhythms of the brain after night milk, while characteristic anomalies arose from diazepam, reflecting the sedative effect of the drug.

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