In dreams and visions, the head of a person symbolizes lordship, ruler-ship, thoughts, intelligence, and the mind of such a person (this has a connection with a pillow). All these words are integrated and complete each other. For instance, bad and negative or depressive thoughts cause a person to rule in a bad way. The mind is the key factor in terms of good leadership. That is why Solomon asked God for wisdom. He knew that he needed the wisdom to govern and to rule efficiently.
God’s wisdom is his word. We can only rule wise when our minds have been renewed. We need to apprehend every thought and submit it unto the word of God. Our heads (minds) need to be full of God’s word and all other thoughts need to be removed and cast away.
The Bible (the word of God) sometimes can be very hard for us to understand or to accept as the true word of God. Sometimes preachers teach doctrines that we do not want to accept although it is truly the word of God. People who refuse to grasp the truths of the Bible can be regarded as people whose heads (intellect) are in the way. Through the years, many people have dreamed their heads or the heads of other people are being or have been chopped off. This speaks of people who need to obtain the mind of Christ by submitting their own minds to the mind of Christ. To see somebody losing his head in a dream or a vision is actually a good thing. It speaks of a person being delivered of false doctrines.
See the meaning of a spider: A spider symbolizes false thoughts of suspicion and jealousy. Just as a spider regards any movement around its web as suspicious, so people symbolized by a spider regards random incidents or events as suspicious. They can easily become jealous because of this. Through the years many people had dreams of spiders on beds or on or between the bedsheets. In this case, a bed and the sheets speak of sexual intimacy and the spider speaks of a false suspicion or jealousy.
This indicates that a person has a false suspicion that his or her spouse is cheating on him or her. The spider indicates that the suspicion is not true.
The fact that the spider is white speaks of such a person being under the impression that his or her suspicion is Biblically or spiritually correct or justifiable (righteous and pure), but, it is not. The spider symbol exposes the fact that the suspicion is not justifiable but actually false.
Because the spider was on the pillow and not between the sheets, it speaks of something as described above (head).