This is pretty easy to learn and can save lives, if someone is breathing but unconscious this position can stop them choking on their own vomit. If you go to any treatment services there will be someone who can show you how to do this.
Note for professionals: This is a visual aid which workers can go through with clients to explain how to put someone into the recovery position
Going Over
Watch this and see if any of these situations are ones that you have seen or been involved in. The best advice is to get any one who goes over into the recovery position and call for help (999)