http://rockymountaintypehouse.com/wp-login.php Local / MAC (Monitored Anesthesia Care): commonly known as “Twilight Sleep,” this type is often administered for certain procedures that involve operations on small areas of soft tissue. The anesthesia provider will first give medicines through an IV that reduce pain and anxiety while the surgeon places local anesthetic in the skin and surrounding tissue to numb the site of operation. Your level of consciousness will be controlled throughout the procedure with IV medications.