Those people tend to fall under hypnosis very easily. They are very easy to recognize for trained hypnotists and they are the reason that staged hypnotism works. The stage hypnotist spots people who are like that in the audience and chooses them for his show.

I believe I am of this suggestibility myself because I often notice myself drifting into a suggestibility state at random moments. I find this very dangerous because if you look at the world today and the way people are talking and acting, it is very negative and limiting.

Most people don't really believe they (or even others) can do anything cool or exceptional with their life. They often foresee the worse possible outcome instead of the optimal possible future reality.

A common example would be someone saying "I hope we won't be late for the show" and another one saying "It's awesome we'll be in time to the show for sure at this rate". They are both living the same situation but they see it in different ways. Their inner talk is different. Their Reality is different. Yet it is the same from an objective point of view.

We are also bombarded with advertising which don't really help our subconscious to feel fulfilled and happy. Since most advertising rely on the idea that you lack something and need to buy it (nice car, fit body, etc.).

So think about it, unless most of your friends and family are very positive people and you hide yourself from TVs and the like, even if you are yourself a very positive person, you're pretty much getting getting hypnotized into being sad.

I think this applies to everyone but especially to those who are of the "somnambulist" suggestibility because while everyone has moments during their day were they drift into hypnosis (hypnosis is a natural state that everyone experiences daily to some extent), those people are suggestible more of the time.

If you have never been hypnotized by a professional it is hard to know when you are drifting or not but here are some things that happens in your body when you do:

1. Your breathing changes.
2. Your eyes move rapidly under your eyelids. (When you close them.)

I highly recommend hypnosis for everyone as it is fun and relaxing as well as very helpful with whatever issue you might have.

Hypnosis occurs when your mind is overloaded with messages. Things such as fatigue influence how many messages your mind can handle before slipping into hypnosis. There are levels of hypnosis and you won't necessarily feel it unless you know what it feels like and pay close attention. Your mind will always reject harmful suggestions but some suggestions that don't necessarily seem harmful at first might still get accepted as truth by your subconscious. Things such as negative thoughts and limiting beliefs that aren't necessarily harmful and sometimes make sense. I don't know about you but I would rather live in a world where I think anything is possible, then in a world where I think that some things are out of my reach.

What I find to be a solution for people like me (and a bonus for people of other suggestibility) is:

1. Don't hang out with people with negative speech unless you have to. Avoid them whenever you feel yourself being tired or suggestible.
2. Talk more, listen less with people that don't talk about stuff you don't believe and don't want to start believing. It is a douche move and won't make you many friends but you will surround yourself with people that think like you and in the way you want to grow.
3. Download or purchase some hypnosis audio about self confidence, happiness, inner power, etc. Those aren't quite as good as seeing a professional hypnotist but since I tend to fall into hypnosis easily I really feel a boost from listening to them everyday. To me it's my own little counter attack to the bad influence of my surrounding world.