I feel something touching me in my sleep but there is no one there, what is this

I am touched often, lately even lightly shaken, and I am not yet sleeping, just having my eyes closed. I think I am sensitive to spirit activity. I don't understand why, however. I am bothered by this and confused.

I saw a documentary on what your saying, and this scientist was saying there is a small part of the brain that has a mini seizure sometimes when people are not asleep, but not awake. In that mid zone.

It is called sleep paralysis. It isn't uncommon at all. What is happening is your brain is waking up while your body is still in REM sleep. This is why you can be awake when this happens. Unlearned people say "I truly believe that this is a spirit that is angry with you because you did something naughty or angered it somehow. My mom is very spiritual and she knows about these things." or some crap like that which just scares people and is counter productive to helping anyone. Vivid hallucinations may be part of this experience. In other words, you perceive an experience of something that is not there. In a broad sense, the hallucinations associated with sleep paralysis can be divided into visual, auditory, olfactory and tactile experiences.
The visual experience can be quite profound. Many people report seeing the presence of a human figure, often described as being a dark figure, shadow or ghost. This figure may be standing at the bedside, just at the periphery of your vision. Some people report seeing multiple people in the room. Others report that they see flashes, bright colors or lights. Sometimes the visual hallucination can be quite elaborate. For example, some have reported seeing a disembodied hand, a gargoyle, bugs or even a cat. In other cases, the visions are vague, described as being blurry or shimmering or simply having a sense that things are floating.
Similarly, the experience of auditory hallucinations in sleep paralysis can range from the routine to the bizarre. Many people hear various noises. It is most common for people to hear voices. The language used might seem foreign. There may the perception of whispering, screaming and laughing. Nearly as often, a loud buzzing or static noise is reported, much like the sound of a radio that is on but not tuned to a station. Some people hear breathing, footsteps, knocking or a ringing sound. Even unusual sounds like a horse carriage or growling may be perceived. Sometimes the sounds heard during sleep paralysis are nonspecific, difficult to characterize or not well remembered.
One of the most often reported phenomena of sleep paralysis is a tactile hallucination, the experience of being touched when you are not. Many people describe feeling a pressure or contact, often sensed as if something or someone is holding them down. Some people with sleep paralysis describe tingling, numbness or a vibrating sensation. Others describe a sense of floating, flying or falling. A few people report feeling chilled or freezing. Less frequently, there may even be a sense that you are being physically moved or dragged from your bed. Some people report sexual contact, including physical sensations involving the genitalia or even rape. Other physical experiences have been reported as well, including a sense of being bitten, bugs crawling on the skin, breathing in the ear or an uncontrolled feeling of smiling.
Also rarely you may smell things. There is a lot of info out there so just research.