First, I'm not a strong believer.Second, I'm doing this because I believe what I experienced was real.My girlfriend and I stayed at a BnB in the Yosemite area in CA this weekend. On the first night at exactly 3am, I woke up, feeling like I was being watched. Approximately 20 minutes later, the cabin started to vibrate. I'm a combat veteran and I've never been that terrified ever.The following night, again 3am, same thing. 20 minutes a vibration. No sounds, no lights. But the same terrified feeling.I don't get scared easily and I believe what I can see. This experience was a horrible feeling. My girlfriend doesn't remember me waking her up, she doesn't remember the vibration, nothing...I'd also like to add that I did not visually see anything. Something was watching us.((NUFORC Note: Source of the report elects to remain totally anonymous; provides no contact information. PD))