This phase II trial compares THC versus (vs.) THC with CBD vs. placebo to improve sleep quality for patients with solid organ cancer and insomnia. Many patients who are diagnosed with cancer struggle with sleep disorders after receiving a diagnosis. Insomnia is the most reported sleep disturbance amongst cancer patients, often stemming from physical changes from tumor growth and surgery, side effects from supportive care and chemotherapy, and stress associated with the diagnosis. THC with or without CBD may improve insomnia symptoms and sleep quality.