From about three months of age, some babies start to become fussy and grumpy when they start to get sleepy. Many moms and dads may think that if they're sleepy, they should just go to sleep.

So, this time, Dr. Konishi, a pediatrician and authority on baby studies, will explain the role of sleep and why babies cry when they get sleepy, which is one of the seven mysteries of babies (?).

Growth hormone is released in large amounts during sleep

It has long been said that "children who sleep well grow well," and this is scientifically true. Growth hormone is released in large amounts during deep sleep, known as non-REM sleep.

Sleep is very important for a growing baby.
The lifestyle pattern of waking up in the morning and sleeping at night is becoming more difficult due to changes in the social structure.

Depending on the lifestyle of mom and dad, you may have difficulty maintaining your baby's daily routine.
Do your best to make sure you get enough sleep.

The wonders of babies! "They cry when they get sleepy"... Why is this?

Even adults find it difficult to fall asleep.
Babies will also cry if they are sleepy but something is disturbing them and they can't sleep.

There could be many reasons, such as having to pee just as you are about to fall asleep, suddenly feeling hungry, or having an itchy head.

The baby doesn't know why, but he senses something is wrong and his sleep is disturbed.
When you first start to fall asleep, you are in a shallow REM sleep. As your sleep rhythm begins to develop, you become more aware of even the slightest abnormality.

Also, if your baby's daily rhythm is irregular, he or she is more likely to feel uncomfortable. It is becoming increasingly important for your baby to maintain a regular rhythm of sleep, wake up, breastfeed, and play.