I tried this last night as I was so bloody tired but just couldn't sleep due to annoying restless legs (I'd been standing a lot at a garden party and this seemed to make it worse!) drank a glass of tonic water and it was a lot better and I could sleep! Someone had told me it was good for cramp and restless legs. Maybe it was the walk down to the kitchen and back which helped but just thought I'd pass it on in case any one else wanted to give it a try, restless legs being so crappy when trying to sleep!