Is it normal that when my head is on a pillow, i hear a beating in ma head?

That would be called your heartbeat.

Thats a pulse going through your ear. Its from your heart.

I used to think it was a Giant walking outside when I was little [laughs]
...Yes, I was a weeiiirrrdd kid :]

I get that sometimes too, it's best to do what Madison said =]

if it's really bugging you to the point where u can't sleep, try turning on a fan or the radio for some background noise to drown out the sound

I get that sometimes too. It has to do with your heart. I used to get that to happen to me when I would be sitting in the reclliner and getting up really fast and going downstairs. The think is, you need to relax yourself before you go to sleep. Like, sit down and listen to music before laying down.

It's your pulse - if you position a finger behind one of your ears near the earlobe you can feel it.

Try sleeping on your back not on your side.

even though you might not hear it twice, definitely your heart beat

That's your heartbeat. You know, that BEATING, THUDDING organ in your chest.

Yep a heartbeat