Since 2018, medical cannabis has been a legal option in the UK when prescribed...

https://mega-wiki.win/index.php/Does_Medical_Cannabis_Knock_You_Out_or_Just_Help_You_Wind_Down%3F

Since 2018, medical cannabis has been a legal option in the UK when prescribed by a specialist doctor. It is rarely a first-line treatment, typically considered only after standard sleep interventions have proven ineffective