is this creepy or am i overreacting

before i tell the story i would like to add that we live next to a massive cemetery and memorial for the fallen vets (but there are bodies there) and they are on the side of the house where my son sleeps.

often times around 3am it's always at 3am my son will wake up in the dead of the night and start laughing hysterically like something is funny. he will laugh so hard it will wake me up on the other side of the house. i will go check on him and he is always just laying down and the room is empty....

i would like to add something in the comments that happened before but was totally unrelated to this (i want to add only in the comments because i dont want it to influence the answer to my question)