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.
Sunburn
To dream that you have a sunburn suggests that you have been trying to elude an issue for quite some time, but you must confront it soon. The stress is causing you great anxiety and if you do not deal with it, you risk physical and emotional illness.
Sundial
To dream of a sundial suggests that your objectives may be unattainable. Perhaps you are striving for something that doesn't actually exist.
Surfing
To dream that you are surfing implies that you are having wavering feelings pertaining to someone or something in your life. You cannot seem to manage your feelings and therefore have a sense of uncertainty and vulnerability.
Surgery
To dream that you or someone else is undergoing surgery suggests that some aspect of your life - a person, issue, or situation - needs to be removed. It is influencing you negatively. Perhaps someone in power is trying to persuade you to do something you are uncomfortable with. Alternatively, you are feeling the influence of some authority figure.
This dream may also be incorporating your anxieties regarding a scheduled operation or your general well-being.