You might think you have a circadian rhythm disorder. But this is very likely not the case… Circadian rhythm disorders are, basically, problems with the timings of sleep.
We don’t necessarily see broken sleep on these people, we see that they sleep a full night but on a different time of day.
If, for example, you notice you don’t get to sleep until 3 am every night and then you can’t get up earlier than 10am, 9am or 11am in the morning. We notice you are getting the sleep that you need but it’s happening at an odd time of the day.
In a person like that it could be delayed phase syndrome, which is a circadian rhythm disorder. But in general, these things are very genetic and we tend to see them from a very early age.
On the contrary, insomnia is much more behavioural and environmental that can trigger at any age.