Since 2018, medical cannabis has been a legal option for specific sleep...

https://finnfazr460.theburnward.com/what-are-realistic-goals-for-sleep-if-i-have-had-insomnia-for-years

Since 2018, medical cannabis has been a legal option for specific sleep disorders in the UK, provided under strict specialist oversight. It is important to note that this is never a first-line treatment, and patient experiences vary significantly