A Hunch?

Sometimes I feel that my son has a hunch when someone is leaving for several days. This week, he always wants to make sure that I am beside him before he sleep. If I am in the living room, he asks me to go to bed with him otherwise he does not sleep. This is unusual because he only sticked with his mother when he felt sleepy in the past few months. So, I wonder if he knows I will not be home next week. I'm not making this up because it happened twice when Allie had business trips. I have no idea why he knows, since I have not packed my luggage or something. Maybe he can sense the atmosphere in the air.