clack clack clack

So, my house is starting to scare me -- I have noticed it before, but now it's getting to me. I woke up last night to noises again. "clack clack clack" it sounded like someone had 2 drum sticks (not the bones, but the ones people use to play drums with) and they were hitting them together. It was not random, but the start and end times were random -- right when I was ready to sleep again it would start and my heart would start to race. I know it's nothing, but my stupid imagination will not believe me. I see little glowing eyes in the dark, monsters in the closet, dark figures standing in the corners...I try to push these thoughts away but it is getting harder with these noises. I was just getting comfortable staying alone and now this is really bothering me. The thing is, I KNOW it's nothing, it's probably something like the water heater in the basement echoing, or even the fridge, I know it makes a sound, maybe since the house is so quite at night, the sound travels up to me, but it still makes my heart jump and my mind stay alert. "clack clack clack" .................."clack, clack, clack"