Crazy reoccuring graphic messed up dream that needs interpretation?

Okay, so I'm sleeping and wake up to use the can hear a couple people outside the front door. Its pitch black so I grab my machete and wait in the staircase next to the door. The door actually unlocks itself somehow like they have a key. These freaking skinny tall aliens come cautiously walking in. I wait for the first to walk by me and chop the second one in the neck and then turn and the first one puts up its hand and I chop through at I chop its head off. I'm covered in black blood. I notice a weird device on one of their hands. I put it on and I can unlock stuff by thinking about it. I'm about to explore other uses for it when my roomate wakes up and walks in and sees the bloody corpses and then I wake up! What do you think it means?