The quote reflects a deep emotional struggle and physical discomfort experienced by the character. The fear of touching his own wrist suggests an intense anxiety or perhaps a trauma that prevents him from connecting with himself physically. This detail emphasizes a profound sense of unease, indicating that even mundane actions become impossible due to his inner turmoil.

Additionally, the mention of insomnia highlights the character's longing for peace, which ultimately eludes him. The imagery of seeking a "third side" in the night illustrates his desperation and inability to find comfort, suggesting that his internal conflicts extend beyond just physical sensations to a broader emotional unrest. Through this passage, Nabokov captures the complexities of human experience in a few poignant lines.