Shift-work sleep disorder is when people who work night shifts or rotating shifts have problems with being tired and sleepy during their night shift and/or problems sleeping during the day. This affects their productivity; it affects their quality of life.  -   Jonathan Schwartz     Quotes
Shift-work sleep disorder is when people who work night shifts or rotating shifts have problems with being tired and sleepy during their night shift and/or problems sleeping during the day. This affects their productivity; it affects their quality of life. Jonathan Schwartz