what goes bump in the night

Now, I'd like to preface with stating that I am not mean to Vegas. I treat her better than I treat myself. You saw the birthday picture. I got up really early to make that PB toast, and I sang "Happy Birthday" to her about ten times that day. So, it's like 3 this morning. We're dead asleep. All of a sudden, I hear this loud thud. I sit up, expecting to find Vegas on alert as well. Except she's not there. I peer over the side of the bed, and she's lying there, staring up at me looking completely confused. She had fallen off the bed. Now that's funny. She was not hurt, but it did take a good half-hour before she'd get back up on the bed again.