Sleep apnea and insomnia

As a child, Susan was an excellent sleeper. She could fall asleep quickly, and typically slept straight through the night, often for as long as 10 hours. As a teenager, then as an adult, she did not sleep as long as she used to (usually about 8 hours), but still had no trouble falling or staying asleep at night. Today, Susan is 67 years old, and although she is relatively healthy, she just does not sleep the way she used to. Over the last few years, it has taken her longer and longer to fall asleep at night, to the point where she is often still awake after midnight. Regardless of how much sleep she ultimately gets, she still feels groggy throughout the day. A friend suggested that she might have sleep apnea and recommended that Susan talk to her doctor about having a sleep study done and possibly getting a Continuous positive airway pressure(CPAP) machine. The way she is feeling, Susan is ready to try just about anything.

1. What are some strategies Susan can try to combat her insomnia?
2. If Susan has a sleep study, what aspects of sleep will be evaluated?
3. If Susan does have sleep apnea, what is happens to her when she sleeps and how might a Continuous positive airway pressure(CPAP) machine help her?