While sleep regulations already exist for the aviation crews, the new policy reflects fears about fatigue dogging the surface force, reports Navy Times.

“Remaining in an alert status, standing watch, performing collateral duties, and other disruptions to a Sailor’s circadian rhythm and sleep periods during high tempo operations can create the conditions for catastrophic mishaps,” the blog post states. “Accident rates for nearly every activity increase after 18 hours of wakefulness, and this fatigue creates the conditions for poor judgement and preventable mistakes.”