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.