Next time your boss gives you a hard time about switching shifts speak up.
According to a new study, it can be hazardous to your health.
Researchers say people who work rotating shifts have lower levels of serotonin than those who have a set schedule.
Serotonin is a hormone that affects your ability to get sleep and low levels are associated with anger, depression and anxiety.
On average, people who work rotating shifts sleep one to four hours less a day.