As a result of her busy schedule, Zellweger, of Bridget Jones
fame, doesn't always have time to sleep. "Your body doesn't quite register...that it's time to sleep," she told W
magazine in 2005, recalling a 10-day, 10-country promotional tour for Bridget Jones: The Edge of Reason
. "But you don't fight it, and you don't ask questions after a while. You just kind of let it happen to you."
Overworked people, celebrities or not, can have trouble winding down before bedtime and might lie awake worrying about their commitments the next day. Experts suggest a relaxing bedtime routine, starting an hour or two before lights-out time, to help your body transition into sleep.
More from Health.com: 7 tips for the best sleep ever