working while still sleeping, somehow you manage to get the job done without being fully awake. Related to sleep walking and sleep talking, only you get paid. Not to be confused with other occupations involving getting paid for being in bed.
The tech support guys on the night shift were very adept at sleep working, the customers calling in never knew they were talking and typing with their eyes closed.
When you go to work Very tired but know the in's and out's of your job so well that you can practically do it in your sleep; therefore requiring little or no thought proccess. You are just kind of in a robot mode; able to perform the neccessary tasks required of you regardless of your current sleep deprivation.