Night is a nightmare

Gerald boy is having difficulty sleeping.
Every night, 2 nights ago, he cried so hard, and wouldn't want to go to bed.
When he is in the room and the lights is off, he cried, when he is out of the room, he is ok.
Am not sure what is wrong.

Since he was like 1.5 - 2months old, he always wake up at night crying. We have been feeding him water only, most of the time he would go back to sleep, but this habit is taking a toll on us. Really hope he can grow out of it soon.

I think he enjoyed his baby cereal.
He dislike my fish porridge, which in the end I ate it.
Today, he likes the mashed milky banana that I prepared, as he had not poo for 2 days. Finally, soon after the banana, the poo is out, and texture is quite hard.