Grammar 
To dream that you are studying grammar indicates that you are having trouble expressing your point of view or thoughts.
Gymnast
To dream of a gymnast represents intensity, poise, and flexibility. You are working towards your goals.
Harness
Harnesses are used to control or equip animals. To dream about a harness often reflects lack of freedom. You may be feeling restrained by your beliefs, and at times you feel others are holding you back.
History
To dream with historical themes suggests that you are subconsciously yearning to be in an earlier time. This may be related to past emotions or events, and may also indicate that you need to update your opinions and thinking. Enjoy living in the present.
Horizon
To dream of a horizon indicates the limitless potential of your life. It connotes the miracle in sunset, sunrise, birth, and death.
Hornets
To dream of a hornet signifies that threats and difficulties lie ahead. Strive to control your temper. On the other hand, being stung by a hornet indicates revenge or hurtful remarks.
Hot Tub
Imagine sitting in a hot tub with steam coming out from the water beneath you. This evokes relaxation.
To dream about hot tub offers you a way out of your daily routine and stress. It brings instantaneous pleasure that belongs only to you. It can also reflect the hidden aspects of your unconscious.
Jaybird
To dream of a jaybird denotes performing work that is enjoyable but not productive. A jaybird that is dead is indicative of an argument or disagreement that you are having with a loved one.
Jumping
To dream that you are jumping signifies that you need to be more adventurous and take on more risks. You will be successful in attaining your goals.
To dream that you fail to jump means that you fear the uncertainties of life. You feel at ease in maintaining status quo.
Juniper
To dream of a juniper tree indicates that joy and prosperity will arise from disappointment, misery, and gloominess.