Bad sleep habits may set you up for poor blood sugar control.

Sleeping for less than 6 hours or more than 9 hours per night was associated with an increased risk of diabetes in a recent study. These same poor sleep habits also were linked to impaired glucose tolerance, a condition marked by higher-than-normal blood sugar levels. Aim for 6 to 8 hours of sleep per night.

Researchers don't know exactly why poor sleep habits contribute to overall health risks. Hormones linked to sleep and wake cycles may play a role. A recent study revealed that sleep deprivation reduces levels of leptin, an appetite-suppressing hormone. If you have trouble sleeping, practice good sleep hygiene: go to bed at the same time every night, avoid caffeine or large meals late in the evening, exercise regularly earlier in the day, sleep in a cool, dark room, and unwind before bedtime. Getting the right amount of sleep is only one part of reducing diabetes risk. Exercising regularly, maintaining a healthy weight, and following a healthful diet also can help reduce risk.