Greyhound 
To dream about a greyhound represents serendipity, joyous gifts, and friendship.
Headstone
To dream about a headstone indicates that you need to unearth something that has been lost, hidden, or forgotten a long time ago. The message written on a headstone often carries an important meaning because it expresses one's whole life in a couple of words. Pay attention to the headstone message for it may tell you things you need to know or acknowledge about yourself.
Heartbeat
To dream of hearing heartbeats rather than seeing the actual heart indicates the blindfolding of your true emotions.
To dream of a heartbeat can also refer to life. You are too used to the sound of a heartbeat that you do not put much thought on it - same as everything else you take for granted.
Similarly, you might also dream about hearing your heartbeat pounding through your chest whenever you are afraid, threatened, or overstressed.
Insurance
To dream that you are buying insurance suggests that you have issues of trust. This mirrors fear and paranoia of losing something or someone close to you. Also, it represents your need to feel secure.
Lightning
To dream of lightning denotes increased awareness, perception, and cleansing. Alternatively, lightning may reflect an unexpected turn of events. It reflects the many uncontrollable interacting forces present in your waking life.
To dream that you are struck by lightning symbolizes changes in your life that are more permanent. Your dream is a life-changing journey - a transformation.
Backstage
To dream of being backstage is notifying you of your ability to understand the truth. The power to change a situation is actually well within your reach. There are certain aspects of your life that will bring you knowledge and help you in moving toward greater success. Be more aware in your daily life of signs and opportunities.
Yesterday
To dream of yesterday is suggesting that you may be stuck in the past, and it is time to forgive yourself, let go, and move forward powerfully.
There may be a simple thought or lifestyle you are hanging onto. Regardless, to dream of yesterday indicates that now is the time to be strong and move on.
Obsession
To dream of having obsessive behavior is an indication that too much energy may be being put into an aspect of your career.
To dream of being obsessed with a person suggests that you may be overworking or nagging someone. Your unconscious may be trying to tell you to slow down and remember to breathe.
Manta Ray
In a dream, the manta ray symbolizes a deep connection to the subconscious. The manta ray lives near the bottom of the ocean, hiding itself in the sand. If a manta ray reveals itself to you in a dream, you are being exposed to a hidden secret within your mind. The manta ray is graceful and effortlessly glides through your subconscious. The manta ray makes an excellent guide to knowing yourself better.
Lawn Mower
To dream of a lawn mower suggests the need to redirect your negative thoughts into something more acceptable and productive. You need to tame yourself and guard against provocation and exposure to situations that might cause you to lose your temper.