Shift workers whose sleep is disrupted by working at night or working long or irregular hours also face increased risks.

CNN: How to combat drowsy driving

High persistence is essential for irregular warfare, such as we face today.

CENTERFORSECURITYPOLICY: Where are the carriers?

He said the numerous lacerations to her face had been caused by "blunt force trauma" inflicted using an "irregular shaped object".

BBC: Rachel Manning 'strangled and hit 10 times'