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The effect of sleep duration on somatic growth is not completely known. One study recorded growth, height, and weight, as correlated to parent-reported time in bed in 305 children over a period of nine years (age 1–10). It was found that "the variation of sleep duration among children does not seem to have an effect on growth."
Waking up earlier in the morning increases the response. [11]Shift work: nurses working on morning shifts with very early awakening (between 4:00–5:30 a.m.) had a greater and prolonged cortisol awakening response than those on the late day shift (between 6:00–9:00 a.m.) or the night shift (between 11:00 a.m.–2:00 p.m.). [12]
"Adequate sleep allows the body to rest and repair itself, regulating hormones that influence blood pressure, inflammation and blood sugar levels—all of which are critically important for heart ...
An equivalent melanopic lux of 250 must be maintained in the period of the day between the indicated wake time and two hours before the indicated bed time. An equivalent melanopic lux of 50 or less is required for the period of the day spanning from two hours before the indicated bed time through the wake time.
Dietary and nutritional choices may affect sleep duration and quality. One 2016 review indicated that a high-carbohydrate diet promoted a shorter onset to sleep and a longer duration of sleep than a high-fat diet. [143] A 2012 investigation indicated that mixed micronutrients and macronutrients are needed to promote quality sleep. [144]
One can see that leptin goes high during the day, then it falls off, before starting the cycle again. The line is a fitted curve to the experimental data, using polynomial expansion, in order to show the periodic behavior of the data. In chronobiology, an ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour day.
Sleep duration—how many hours a night on average—was assessed at 3 time points: baseline (2013-2017), first follow-up (2017-2021) and second follow-up (2021-2023).
As sleep time decreased over time from the 1950s to 2000s from about 8.5 hours to 6.5 hours, there has been an increase in the prevalence of obesity from about 10% to about 23%. [2] Weight gain itself may also lead to a lack of sleep as obesity can negatively affect quality of sleep, as well as increase risk of sleeping disorders such as sleep ...