Prescribed Melatonin by my Doctor (UK)

I just thought I'd share. I, 51m phoned my GP (UK NHS) basically just saying I'm having very poor sleep, is there anything they can give me. I was quite surprised by how high the dosage was though (2mg prolonged-release made by Mylan) I'd read 300ug was sufficient.. At least I know the Melatonin I'm getting is pharma grade, so that's a bonus.