It’s normal if you want to take a siesta after lunch. (Especially if, um, you went for a big burrito or pasta meal.) But poor quality sleep may be the culprit if you notice that you’re sleepy during the morning and afternoon and are dozing off during inopportune times (like at your desk or on the train). In fact, consider that you may have sleep apnea. “Most people think they’re asleep at night but those with apnea are having very broke, disturbed sleep all night, which leads to excessive daytime sleepiness for many,” she says. Talk to your doctor who may want to set you up with a sleep evaluation.

Sleep and mental health

Once viewed only as symptoms, sleep problems may actually contribute to psychiatric disorders.

Americans are notoriously sleep deprived, but those with psychiatric conditions are even more likely to be yawning or groggy during the day. Chronic sleep problems affect 50% to 80% of patients in a typical psychiatric practice, compared with 10% to 18% of adults in the general U.S. population. Sleep problems are particularly common in patients with anxiety, depression, bipolar disorder, and attention deficit hyperactivity disorder (ADHD).