I was just followed by a helicopter today. It spotted me in the park and followed me home. Took me a while to realise it was following me and it started to really annoy me. I have also had aliens appear in my bedroom and seen ufo's.
Some aliens are good though and are more like healers, guardians and angels. They work with us to help activate, improve our dna and heal all kinds of blockages. I now work with some blue beings in my healing work. They have a lovely energy and are very nice. Some of the good ones came into my room once and I was freaking out because aliens are stigmatised as beings evil. However, I have learnt techniques to get rid of them if they are not there for your highest good.
An yes, there is also the dark side but it's not to be feared. I used to be harassed by ghosts and demon like creatures. If you fear them they feed off that negative energy and won't leave you alone. If you are angry at them they also feed off that energy or react to it and become more aggressive. Best thing to do is to be assertive. Then after some intense spiritual development courses, I realised the world we live in is like a matrix where everything is a reflection of us and if we are experiencing something we don't like, it's because we are not healed in that area. The darkness harasses you because it is saying "what about me". It needs to be acknowledged. It means on some level you are not owning your own darkness or dark side or have it out of balance and it may be so unconscious you may not be aware of it. So this is the universe's way of showing you where you are unhealed and it will keep throwing these tests to you until you get it.
It's like the universe is giving you a wake up call - a crash course. So, next time I saw a dark being I said "Thank you for the lessons but it's now time to leave". It didn't have anything to say and yes it left because it realised it didn't have anything to teach me anymore.
You can also say "Thank you for the lessons but it's time to leave. According to Spiritual law, if you are not here for my highest good I command you to leave at once or I will call in my highest guides, angels and beings working for my highest good to come in and transmute you to golden light instantaneously." You can callin God, Buddha, or Jesus, etc instead. They disappear and if they don't say "I command God and golden light to come in and transmute any negative beings, entities and energies on the count of three! one... two ... three *clap hands*. Thank you thank you thank you".
Basically, THEY DON'T HAVE THE RIGHT TO BE HARASSING YOU.
It worked for me and has worked for others!
Hope this helps.