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.
Jupiter
To dream of the planet Jupiter stands for victory, optimism, generosity, and lavishness.
Leather
To dream of leather indicates sturdiness and toughness. You seek refuge from the harshness of the world around you.
To dream of leather is also suggestive of the carnal nature in your waking life.
Leeward
To dream that you are sailing leeward tells of exciting travels and adventures.
Legumes
To dream of legumes denotes petty fights and minor setbacks.
Lobster
To dream of a lobster symbolizes power and dedication. In all you do, you always come out victorious.
To dream that you are eating lobster denotes that you will get back on your feet and face the world with confidence.
Locusts
To dream of locusts denotes poor psychological health. You feel insecure and are taken aback by your lack of or regressing originality. On the other hand, dreaming of locusts may symbolize new beginnings and personal progress.
Warning
To dream of a warning may be as simple as your unconscious mind making sure you are aware of a current happening in your waking life.
Heed any warnings in a dream, and check in with your emotions surrounding waking life warnings. Dreaming is often a way that more aligned aspects of yourself can offer important advice.