To dream of knots represents your anxiety over trivial things. You may be seeking for a solution to a problem at hand. It also suggests barriers and restrictions in your thoughts and emotions.
To tie a knot in your dream symbolizes self-sufficiency and an unyielding nature. You enjoy being in full control of situations. To dream of a knot may also symbolize a coming together of two persons, such as an agreement or a commitment to a relationship as commonly referred to in the phrase 'tying the knot.'