This study is about a medicine called solriamfetol, which helps people who feel very sleepy because of working night shifts. Night shift work can mess up your sleep, and this study aims to check if solriamfetol can help. It's a Phase 3 trial, which means it's in the later stages of testing. Participants will be given either the medicine or a placebo (a pill that doesn't contain medicine) to see if solriamfetol is safe and works well. The study lasts for 12 weeks, and you will take the pill once every night shift. To join, you must be between 18 and 65 years old and meet specific sleep disorder criteria. You cannot join if you've used solriamfetol before or can't follow the study rules. If you choose to participate, you'll help researchers learn more about treating shift work sleepiness.

• Study lasts 12 weeks, with medicine taken nightly.
• Randomly assigned to solriamfetol or placebo group.
• Must be aged 18-65 and meet sleep disorder criteria.