Help! My 20month old won't eat....at all.

My 20 month old son is a high energy, fearless kid that loves to climb on counters and will just leave and walk down the street by himself if the door is left open. He's always been the kind to nibble at food, rarely eating anything I would have considered a complete meal with my other kids.In the last several days, he has just about refused any food. He insists on nursing but my wife has very little to offer anymore. He won't drink milk, juice, or formula. He refuses to eat at meal time and seldom snacks. We don't know what he's getting for nourishment. This leads to him being awake a large portion of the night just screaming. We try to give him food but he won't take it and won't settle down until he nurses. But he's up a short while later because he's not getting much from nursing either.He doesn't appear malnourished and plays at a high energy level but we are concerned for him. We selfishly want our sleep and selfishly want him to eat for his own good. He doesn't know he's starving.Please, I'm open to any suggestions. via /r/Parenting http://ift.tt/2idvsJF