Seaweed 
To dream of seaweed indicates that you must be confident that your feelings and perceptions will guide you down the right path.
Shadows
To dream of seeing your own shadow represents a hidden part of your personality or character that you are unaware of. These attributes may not necessarily be derogatory, but perhaps you are reluctant to reveal them to others out of fear of rejection or embarrassment.
To see a shadowy figure in your dream indicates that there are traits you possess but don't fully realize or comprehend. It can also represent someone who is immature, naive, and impressionable.
Shaking
To dream that you are shaking represents your need to make an important change in your life and adopt new opinions and attitudes. Make a radical or unorthodox decision. It may also indicate that you are feeling afraid.
Sinking
To dream that you or something is sinking implies that you feel overpowered by a situation, issue, or person. You may harbor emotions of unworthiness and unimportance. It is possible that you may be reaching the conclusion of a phase or period in your life. Pay attention to the item that is sinking and determine the symbolism of this item.
*See Drowning
.
Smoking
To dream that you are smoking implies that you are refusing to allow others to be too close to you. You are trying to protect yourself from being hurt emotionally.
Sparrow
To dream of a sparrow symbolizes your self-respect and pride. Remember that you don't always have to be the strongest and most important in order to achieve your goals.
Spiders
To dream of a spider denotes that you are being ignored and overlooked by others. Perhaps you feel that it is best to avoid someone or something that will only influence you negatively. The spider also represents female strengths and intensity. It may be implying that there is some entity trying to keep you safe from your own actions. If you kill a spider, it indicates that you will soon face hardships and obstacles.
To see a spider spinning a web implies that your energies and exertions will result in great gifts. This can be in the form of career advancement, elevation in social status, or prosperity. Spiders represent imagination and artistic nature.
On a negative note, spiders may suggest that you feel stuck in a negative relationship. Perhaps your significant other is being too dependent on you. It can indicate that you are being influenced by someone or something that is detrimental to your happiness or safety.
To see a spider climbing up a wall in your dream implies that you will achieve your goals in the near future.
To dream that you are bitten by a spider symbolizes an issue between you and a female associate. You may be feeling entangled in a relationship that you no longer want to be a part of.
Spindle
To dream of a spindle symbolizes durability and endurance. It implies that you should be careful of what you do and say. Your actions and words will always come back to haunt you.
Spirits
To dream that you are talking to an unknown spirit implies that you are being manipulated or taken advantage of by someone close to you.
Generally, if the spirit is known and welcomed, it represents success and prosperity in your occupation.