It is pointed out that in the deep sleep period of the first cycle after falling asleep, the peak time of secretion is about night 1 1 to 3: 00 midnight, and secretion lasts for about one and a half hours to two and a half hours. Therefore, a growing child and teenager had better go to bed before this moment.
Some studies have also pointed out that about 1/4 young people's secretion peak occurs before going to bed. During sleep deprivation, his growth hormone is inhibited, so it is not advisable to stay up late in childhood study, otherwise it will affect his height, weight and development. Poor sleep, sleeping without sleep, all hinder growth.
Adrenal cortical growth hormone
Stimulate the adrenal cortex to secrete steroids, and its concentration is the lowest at the beginning of sleep, that is, when people want to sleep; The highest is from 4 am to 8 am. Sleeping during the day does not inhibit the release of corticosteroids, and it secretes regularly day and night.
parathormone
It is found that there is a peak value every 100 minutes during sleep, and its concentration is related to deep sleep.
Melanin (melatonin)
Melanin can only be activated by neural pathways at night and inhibited under strong light. 1~3-year-old children's secretion reaches its peak at night, decreases in adolescence, and then decreases in old age. Melatonin will start to rise in the evening, reaching its peak at about 3:00-5:00 in the morning, and will drop during the day, with the lowest concentration. This is why humans and many animals sleep at night and work during the day.
Plasma prolactin
Plasma prolactin concentration is the highest during sleep and the lowest during waking. The study found that its concentration began to rise about 60 minutes to 90 minutes after falling asleep, peaked at about 5 am to 7 am, and then began to decline.
thyroid hormone
The secretion of thyroid stimulating hormone (TSH) in normal people has a circadian rhythm, with a low concentration during the day, rising in the evening, reaching a peak at night before going to sleep, and being inhibited immediately after falling asleep.