Signs that your residence may have visitors of from beyond
Unexplained noises - footsteps; knocks, banging, rapping; scratching sounds; sounds of something being dropped. Sometimes these noises can be subtle and other times they can be quite loud.
Doors, cabinets and cupboards opening and closing - most often, these phenomena are not seen directly. The witness either hears the distinct sounds of the doors opening and closing or the witness will return to a room to find a door open or closed when they are certain that it was left in the opposite position. Sometimes furniture, like kitchen chairs, are perceived to have been moved. Very rarely will the witness actually see the phenomenon taking place.
Lights turning off and on - these events are seldom seen actually occurring, but the lights are switched on or off when the witness knows they were not left that way. This can also happen with TVs, radios and other electrically powered items.
Items disappearing and reappearing - this phenomenon, is the familiar experience of not being able to find a regularly used item - say, your set of car keys - which you believe you placed in a spot you routinely place them. But they're gone and you look high and low for them with no success. Some time later, the keys are found - in exactly the place you normally put them. It's as if the object was borrowed by someone or something for a short time, then returned. Sometimes they are not returned for days or even weeks, but when they are, it's in an obvious place that could not have been missed by even a casual search.
Unexplained shadows - the sighting of fleeting shapes and shadows, usually seen out of the corner of the eye. Many times, the shadows have vaguely human forms, while other times they are less distinguishable or smaller.
Strange animal behavior - a dog, cat or other pet behaves strangely. Dogs may bark at something unseen, cower without apparent reason or refuse to enter a room they normally do. Cats may seem to be watching something cross a room. Animals have sharper senses than humans, and many researchers think their psychic abilities might be more finely tuned also.
Source: Aliens the Truth