Brutus explains that he has not been able to sleep. How does he explain to a man's conscience between the "acting of a dreadful thing / And the first motion"?

Brutus explains that a man's unconscious mind is more superior than his conscious mins, overtaking authority and ruling his actions at times of a conspiracy.

Explanation:

In Act II scene i of the play "The Tragedy of Julius Caesar" by William Shakespeare, Brutus is in a dilemma about the proposed plan of killing Caesar. He along with other conspirators including Cassius had decided on taking the life of Caesar so as to stop him from being made the ruler of Rome.

When Brutus states "Between the acting of a dreadful thing  And the first motion", he is explaining the internal struggle that he's facing at the face of murdering Caesar. He is so caught up in the act of the plan, admitting that the time in between the plan and the actual act of doing it is the worse time of a man's life. He believes that a man's unconscious mind and body overthrow/ supersede his conscious mind when conspiring things.