Medical cannabis has been legally available in the UK via specialist...

https://wiki-dale.win/index.php/Can_Medical_Cannabis_Help_with_Staying_Asleep,_Not_Just_Falling_Asleep%3F

Medical cannabis has been legally available in the UK via specialist prescribing since 2018. Clinically, it is typically considered only after standard, evidence-based treatments for insomnia have been exhausted