At this point, we all know the things we're supposed to be doing to get better sleep. That means exercising regularly, keeping a consistent bedtime, and going easy on the caffeine. What you might not realise is that there are so many other things that can affect your sleep in ways good and bad that you might not even be aware of.And that's exactly what Holly Phillips, MD, explains in her recent book, The Exhaustion Breakthrough . Everything from your diet to your period may play a role in how easy (or difficult) it is for you to drift off to sleep.We talked to Dr. Phillips to get the details on all the unexpected things we're overlooking. If you're struggling with your sleep, and you've already done the normal sleep hygiene routine, don't despair. These things might be the problem. And the good news is that there are ways to fix 'em.