Today's Globe: sleep, food labels, yoga for Alzheimer's patients, Cadbury recall

Alarmed by recent studies tying lack of sleep to poor academic performance, college officials are urging students just to go to bed. More than a dozen Massachusetts schools have begun waging campaigns touting the benefits of sleep through dorm seminars, posters, and catchy slogans like, "Want A's? Get Z's."

Twice a month, Patrice Flesch tailors yoga for people with Alzheimer's, dementia, and other conditions involving memory loss.

No more wondering where your hamburger came from, or where your lettuce and tomatoes were grown: Starting this week, shoppers will see lots more foods labeled with the country of origin.

British candy maker Cadbury said it is recalling 11 types of Chinese-made chocolates found to contain melamine, as police in northern China raided a network accused of adding the banned chemical to milk.