Reality Check (ru.ahtartam.realitycheck) on Google Play
Reality checks are used in almost every lucid dreaming technique. As such, they are the first skill most lucid dreamers learn and the tool they rely on most throughout their dreaming career.A reality check is a simple thought-process or action that is consistently practiced (during waking life) to evaluate whether you are dreaming or not. This may sound silly, but the more you practice, the more likely you will be to do it in your dreams. Habitual actions and thoughts recur more frequently in the dream world, just like in normal life, which is why training yourself to practice your reality checks often will translate into more lucid dreams.