Hypnosis is natural, we are all in and out of trance every day. The hypnotic state is a very natural state of physical relaxation and heightened mental awareness whereby an action is felt to "just happen" automatically without conscious effort. For example, when you are driving, you often slip into a trance state where the conscious and unconscious minds appear to concentrate on different things (conscious mind focus and think about the task later on & your unconscious mind is focusing on driving the car).

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Let me explain based on my personal view, personal experiences and research studies:
A lot happens in your body while you sleep. When you get your ZZZs, you cycle between REM and non-REM sleep.
REM stands for rapid eye movement. During REM sleep, your eyes move quickly in different directions. That doesn't happen during non-REM sleep.
First comes non-REM sleep, followed by a shorter period of REM sleep, and then the cycle starts over again.
Your dreams typically happen during REM sleep
REM sleep and tonic immobility(Some people refer to this state as a trance or hypnotic trance) similarity are:
-Both states show a similar EEG pattern with additional “theta” waves linked to the brain’s hippocampus  (which plays an important role in memory and spatial perception)
-Both states show strong loss of muscle tone and suppression of reflexes
-Both states show changes in heart and breathing rate
-Both states affect the body’s ability to regulate body heat
-Both states show changes in the brain’s biochemistry including increased acetycholine and decreased serotonin and norepinephrine in the brain stem
-Significant changes in eye movement, facial twitches, and jerking limbs in both states
-Also, both states rarely last longer than a few minutes, varying from five seconds to 20 minutes
-Both tonic immobility and REM sleep appear to be linked to parts of the brainstem involved with sleeping, eating, and breathing.   

They also appear to have very similar roles in helping the body recover from traumatic experiences.  As an emergency reaction to extreme danger,  tonic immobility prepares the body to cope with trauma and heal afterward.  This happens through the release of brain chemicals such as acetycholine to reduce pain and increase drowsiness.  Research into  REM sleep  has found many of these same biochemical markers which suggests that the vivid dreaming experienced during REM episodes plays a strong role in helping the body cope with stress and trauma. 

You dream excessively and you love hypnotic trance state (You love to drive and experience"highway hypnosis"), reasons could be one of the following conditions:
1) You're going to need to learn to manage your stress better.
2) Your parietal lobe might be overactive, the parietal lobe processes visual, auditory and touch information.
3) Your temporo-parietal junction is overactive. In 2013, Ruby published a study which found people with higher levels of temporo-parietal junction activity were light sleepers. "This may explain why high dream recallers are more reactive to environmental stimuli, awaken more during sleep, and thus better encode dreams in memory than low dream recallers. Indeed, the sleeping brain is not capable of memorizing new information; it needs to awaken to be able to do that," Ruby said.

Possible solutions:
For your case, EEG biofeedback and hypnotherapy might be helpful.
One of my clients gave me her testimonial after solved her excessive dreaming problem.
Her case is almost same as what you described over here. She had suffered for excessive dreaming problem for more than 20 years.
What I did for her? I taught her how to calm down her overactive parietal lobe area by using neuro-hypnotherapy technique (EEG biofeedback+hypnotherapy), thus her problem solved. The biggest difference notice is that now her sleep quality has improved significantly, increase deep sleep and dreaming occurs to a lesser degree. 
Source:
https://www.psychologytoday.com/blog/media-...stery-rem-sleep
http://www.techtimes.com/articles/3682/201...than-others.htm
http://www.webmd.com/sleep-disorders/guide/sleep-101