Yes, I have. In fact, it is fairly common. Although I'm going to use the term overshadowing to describe a more minor form of entity influence that is the most common. I dislike the term possession because actual full possessions are rare and usually happen to people who are devil worshipers or those who mess with Ouija boards and actually summon demons in to our world.
Entity attachment is pretty common, and even more common for empaths. One of my favorite quotes as an empath is that "everything is energy". Humans generate and release energy. And empath energy is like a fine wine that is especially attractive to entities. Entities (spirits and otherwise), need to capture energy to exist. But they don't like high vibrational energy. They want our low energy. So when someone goes through a really tough time (anger, sadness, grief etc...), their vibration drops. And these creepers zero in on that and attach like a leech. At first they hit the outside of your aura where they start draining you. But quite a few entity types want to get deeper. And as you get cracks in your aura or extended periods of time with low vibration, they start rooting themselves deeper into your being. When this happens overshadowing can happen where the entity can influence the host's mind to think and do things that are not normal for them.
You can have entity attachments for a short while or even as long as many years. And it's fairly common to have multiple attachments. And quite often the draining aspect of attachments can lead to declining health. Anyway, getting back to overshadowing,when attachments influence you they influence your thoughts. They can hear your thoughts and they have a deep understanding of your personal subconscious. They know your fears and insecurities. So they can try to lower your vibration further by sending bad thoughts to your mind that will make you feel guilty, ashamed, and generally really bad about yourself. When I personally went through the worst of my attachments I had a lot of thoughts that I now realize were not mine that kept telling me that I was a loser, that everyone hated me, and that I did not have any worth in this world. Back then thoughts like that pushed me deeper into depression. And that was the plan for these entities. They want more of your low energy and squeeze it out of you by manipulating your mind with ill thoughts.
Another good example of a spirit attachment overshadowing someone is when you see a person who doesn't normally drink, or do drugs. And they all of a sudden become a different person and become a party animal and jump head first into dangerous behavior. When this happens the spirit attachment may have been a drug addict when they were living on the earth plane. And they miss the physical feeling of getting a drug high. So they will do some light possession/overshadowing of a living person so that they can get that person to do drugs so that they feel that physical feeling again. I don't know if you've ever known someone where you've seen a dramatic shift in behavior where they are not acting like themselves. It doesn't have to just be someone becoming a drug addict. Sometimes it can be as simple as a sweet well-meaning friend who all of a sudden is angry at the world. When a change like this happens, it is likely that they are being influenced by an attachment.
Empaths are big time targets for entities because of their attraction to our energy, and also because we are light workers and we are on the other team. We have the ability to stop their actions and destroy them. We can heal people and undo their influence. So they get bonus points in their world by distracting and harming an empath/light worker. This is why its so important for empaths to monitor their vibration daily and take steps to ground and raise your vibration. You don't want to allow yourself to get a lowered vibration long term where these things can attach, drain, and influence you.