By Art Holliday

St. Louis (KSDK) - We all know not getting enough sleep can make you grumpy, but some new information also shows when you sleep and when you work could actually put your life at risk.

NewsChannel 5's Art Holliday spent years and years getting up in the middle of the night to come to work on Today in St Louis, so this is something he personally knows all about.

It's not just newsrooms that operate 24 hours a day, seven days a week. Many of our viewers know all about shift work and how difficult it can be to work an unconventional schedule.

A new study involving two million people should get the attention of shift workers and their employers.

Click the video player above to hear what the study says.

KSDK