I am aware that a child preferring one parent over the other is nothing unusual. My son mostly has a bias for his mother. She can suite him more easily, put him to sleep a lot more easily and he notices her being gone a lot quicker.
At night for some reason, he tends to gravitate towards my side of the bed (he sleeps in the middle), even placing his head on top of.
What could be the reason for this? It seems to be fairly common.
He also moves to my position in advance before I go to bed.