What is the reason why children cry at night while sleeping?

Patient's question:

My son is 8 months old. Recently, for about a month, he has been crying in the middle of the night while sleeping. His mom has to hold him and comfort him for a while, and then he falls back asleep. This cycle repeats four or five times a night. I don’t know what the reason is. I took him to the hospital, but they couldn’t figure out what was wrong.
Please give advice from a real doctor. Thank you! At the same time, I strongly despise netizens who pose as doctors and treat others’ health care lightly.

Doctor's answer:

Here is the English translation of the provided content, with the original line breaks preserved and all Chinese text translated into English:
"Baby doesn't sleep soundly, crying and fussing—reasons and solutions
1. Lack of trace elements, reduced blood calcium leading to increased brain and vegetative nervous system excitability, causing restless sleep at night. Calcium and vitamin D need to be supplemented.
2. Too hot or too cold.
3. Indigestion, poor digestion, heatiness, or overeating at night can also cause sleep disturbances. It is recommended that solid foods like porridge or noodles should be fed at least two to three hours before bedtime, followed by a small amount of milk before sleep.
4. If the baby cries, don't respond immediately. Wait a few minutes, as most children will naturally fall back asleep within a few minutes after waking up at night."

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