Okay so I have my own room in my house, and my cat, Pixie, sleeps in my room with me. Her little cat bed is right next to mine, and sometimes i can reach out and pet her if i want. So anyways I like to stay up late and watch netflix on my iPod with my headphones on. And sometimes my cat will wake up in her bed and make this noise (it sounds like a meow but she keeps her mouth closed so like a purr/meow). She only makes that noise when she's curious about something or when I wake her. But she does it all on her own as if something startled her or she heard something (I wouldn't be able to hear what she's hearing because I have my headphones on, but she makes that noise really loud). And then after she wakes up she will get out of her bed and sit perfectly in the middle of the floor for a few minutes then she will go back to sleep. I get so scared everythime she does that. But when I decide to go to sleep and put my headphones away, I hear weird noises and yet my cat is deeply asleep. I don't know if I'm the only who hears these noises but no one else in my family does.