The idea is that the planet Mercury rules all types of communication, travel, formal contracts, agreements and networking with people. During Retrograde, the planet Mercury is said to be sleeping or resting, leaving its usual tasks out of whack.
Mercury, being the planet of communication, technology and everyday travel, basically rules our day-to-day stuff. From emails and texts, driving, errands, public transport and anything else that has to do with going somewhere, using devices and communication with others. When Mercury enters one of its retrograde periods the astrological consequences involve all those aforementioned areas of our lives exploding all over the place.
But fear not! Retrogrades mark a good time to think instead of act, to reflect instead of react.
During Mercury Retrograde it's wise to double check your e-mail responses. Check in with your reservations to confirm them before taking off for that trip overseas. Keep your computer systems up to date before entering into a retrograde period. This is basic survival for the seasoned retrograde soul.