This study looks at a medicine called TAK-360 for people with sleep disorders like narcolepsy and idiopathic hypersomnia (IH). Narcolepsy is a condition where people may suddenly become very weak due to strong emotions or feel sleepy during the day. IH is when people feel very sleepy all day and don't feel rested after sleeping. The study aims to see how safe and effective TAK-360 is over a long period. People who were part of earlier TAK-360 studies can join if they meet certain rules. Everyone in the study will get the TAK-360 medicine, even if they got a placebo (a pill with no medicine) in the earlier study. Participants will need to visit the clinic several times.

• Participants must have completed a previous TAK-360 study.
• Participants will receive TAK-360 medicine during the study.
• Regular clinic visits are required.