The fact that Lady Macbeth is sleepwalking in the first place is significant, as it suggests that she is not fully in control of her own mind and body. She is acting out her thoughts and feelings in her sleep, and she is not able to control or suppress them. This is evident from the way she speaks and acts during the scene, as she is disjointed and incoherent. She also seems to be unaware of her surroundings and the people around her, which further suggests that she is not fully present or in control.
The content of Lady Macbeth's speech during the sleepwalking scene also suggests that she is suffering from guilt and remorse. She repeatedly mentions the murder of Duncan, and she seems to be trying to wash away the blood from her hands. She also speaks about being afraid of the dark, and she seems to be haunted by the image of Duncan's ghost. These all indicate that Lady Macbeth is not at peace with herself, and that she is struggling with the guilt of her actions.
In conclusion, Lady Macbeth's actions in the sleepwalking scene suggest that she is in a state of extreme mental anguish and guilt. She is clearly troubled by her role in the murder of King Duncan, and her sleepwalking is a manifestation of her subconscious mind trying to process and deal with the trauma of her actions.