Liberación sexual y evolución.

[Isocrates]

Por cierto, y ya que todo esto ha comenzado a raíz del llanto y la ansiedad...

http://pediatrics.aappublications.org/cg...5/1/S1/217

Objective. To examine factors associated with the phenomenon of yonaki, or sleep-related nighttime crying (SRNC), in Japanese children

Methods. A cross-sectional design incorporating parental self-report was used to investigate relationships between developmental, psychologic, and constitutional/physiological factors in the incidence of SRNC. Participants were the parents of 170 infants, 174 toddlers, and 137 children at a well-infant clinic in Tokyo, Japan.

Results. The lifetime incidence rates of SRNC were 18.8% (infants), 64.9% (toddlers), and 59.9% (children). At all ages, children were most likely to cosleep with their parents; however, infants with reported SRNC were found to cosleep more frequently, whereas infants without SRNC were more likely to sleep in separate, child-dedicated beds. Toddlers with frequent SRNC were more likely to have irregular bedtimes and to have nonparental day care than were those without SRNC. Preschoolers who typically slept 9.5 to 10.5 hours per night were less likely to report SRNC than were children with longer or shorter nighttime sleep durations. In all groups, children with frequent SRNC were more likely to suffer from chronic eczema, and toddlers and preschoolers with SRNC exhibited bruxism more frequently.

Conclusions. The traditional Japanese arrangement of cosleeping represents an environment in which parents are readily accessible to children during waking episodes. Physical proximity to the parents in infancy, but not at other ages, is associated with SRNC. The higher incidence of bruxism, chronic eczema, and day care use among children with frequent SRNC supports the hypothesis that nighttime anxiety may promote SRNC.

Y el problema del sueño en Japón parece bastante más común de lo que podría pensarse... porque ¡aparece incluso en estudios sobre el uso de energía!

http://www.japanfocus.org/products/topdf/2394

And the Japanese, people with an even greater chronic sleep deficit than Americans, keep their fluorescent tubes and compacts lit much longer than do people in any other affluent nation, averaging about 3.4 hours a day per light, compared to 1.9 hours in the U.S., 1.5 hours in Germany and a mere hour in France. [11] In a search for specific factors that would explain this significant difference I suggest three realities, none of them unique to Japan but all of them quite pronounced in that country. The first factor that contributes to longer use of electric lights is Japan’s ubiquitous long-distance commuting that often starts and ends in darkness. Consequences of the chronic cumulative sleep deficit induced by this practice are well illustrated by a recent survey by InfoPlant market research: two-thirds of males and 71% of females sleep when riding a train. [12]

The second factor is a sleep pattern common among Japanese high-school students: napping (inemuri) during the late afternoon and then studying late at night and into the early morning. Steger concluded that “regardless of possible considerations of whether it makes sense, this rhythm seems to be a set sleeping pattern for students in general, and in particular for high-school students preparing for exams. Since everyone follows a similar rhythm, it is difficult for an individual to change or even seriously question it.” [13] Finally, there is a traditional Japanese arrangement of infants and small children sleeping with the parents, who are readily accessible to children during waking episodes: this practice obviously leads to more light-switching at night, besides making yonaki, sleep-related nighttime crying, more common and a matter of concern for the country’s pediatricians. [14]

Aunque diría que nadie tiene las cosas excesivamente claras