But then they also experience deep sleep, which means the person slips deeper into the subconscious level. This is not a bad thing because deep sleep is the most restful kind of sleep you will ever experience. As you experience a decrease in active brain activity while sleeping, the THC in cannabis will help you stay in the subconscious world long enough to have a restful sleep. People who suffer from post-traumatic stress disorders or insomnia will need cannabis to calm the mind’s activity, which translates into calmer dreams.