If you could buy a product that made you think better, feel better, and be healthier, would you invest? Sleep does all that for free, but more than a third of adults aren’t getting the recommended seven hours of sleep each night. We’ve outlined five common sleep problems and asked the experts how to overcome them so you (and your partner) can enjoy sleep’s restorative powers at last. The solution: The important tools are patience and persistence: Most people have to try a few potential fixes. Snoring tends to be related to loose tissue at the back of the throat that partially blocks your airway when you’re lying down. Breathing makes it flap like a tarp on a car in the wind—sleeping on your back makes it worse. To get a back-sleeper to turn over, “use the tennis ball trick,” says Shelby Harris, Psy.D., a sleep psychologist in Westchester, NY. Here’s how: Sew a small ball in the pocket of a T-shirt and wear it to bed backward. The discomfort will train you to sleep in a different position. Or ask your dentist about getting a mouth guard that stops tissue at the back of the throat from blocking airflow.  Sleep apnea happens when your airways become completely blocked during sleep....