What research shows
Like snakes, over-represented relative to real exposure — a common argument for inbuilt threat responses.
Animals
Dreaming about spiders
Entrapment, patience, or something being woven.
The psychological reading
The web matters as much as the spider: a situation you feel caught in, or one you are patiently constructing.
What tradition claimed
In much of Europe a spider was good luck and money coming.
Included as cultural history. Traditional dream books are frequently ominous and have no predictive value.
What to do with a dream like this
Write it down before you move. Dream recall collapses within minutes of waking, and the details that vanish first are usually the ones carrying the emotional weight.
Note how it felt, not just what happened. The same image arriving as comfort and as threat are different dreams, and no dictionary can tell you which one you had.
Then look at the last two or three days rather than at your whole life. Dream content tracks recent waking concerns more reliably than it tracks anything else — that is one of the few findings in dream research that holds up consistently.
When a dream is worth more than curiosity
Recurring nightmares that disrupt sleep, or dreams that leave you afraid to go to bed, are worth mentioning to a doctor. Frequent nightmares are associated with PTSD, some medications, sleep apnoea and untreated anxiety — all of which are treatable, and none of which a dream dictionary addresses.
Before you look anything up
How the dream felt matters more than what was in it. The same image can arrive as comfort or as threat, and that difference tells you more than any entry in a dictionary — including this one.