a mixture of thc and cbd at a low dose would be better considering the no alcohol.
with a mixture you would get a nice calming effect and might even sleep better. what to buy..... see if you can find a company that makes a mix dose of thc/cbd. a small tincture bottle would probably last you quite a while and cost far less than beer. plus be so much more healthy for you. :)
consulting with a doctor familiar with cannabis could also help. people will tear my recommendations down as i am not a qualified this or that.