I think that the best reality check you can possibly do is just looking at your environment and asking yourself if everything is right, how did I get here? Does that make sense? Ask yourself what day it is, what time and so on and so forth. In a dream, almost always, one or more of these things just arn't right =) It takes some more effort and getting used to, but this kinda general awareness seems to work best for me All the 'classic' reality checks don't really seem to work for me all that much =/