Girls. My son is one and a half years old, he has trouble sleeping at …

Girls. My son is one and a half years old, he has trouble sleeping at night (not teeth, but constantly). He eats 1-2 bites while falling asleep during the night. I've tried relaxing, doing massages, chamomile and mint teas. He sleeps like this even if he gets tired during the day in the open air. Can anyone suggest what it might be or any proven remedies?