Is it normal to have a whisky pegs of 50ml daily before sleeping

You probably already are an alcoholic. I would say you are. You should really try to break the habit. One thing you could do is avoid caffeine and sugar drinks within the four to six hour period before trying to go to sleep. And maybe, to get your normal non-alcoholic aided sleep schedule back on track, try taking a couple spoons of Nyquil or something similar. Don't over do it though, you don't want to get addicted to those too.

Not normal. If you do that for 7years you will become alcoholic.

have 100 its much betta!