For me, it has only got worse... Sorry!
I have been soooo tired throughout this entire pregnancy... there has always been something stopping me from sleeping.
Now, it is either heartburn, my pubic bone, my hips or just the simple fact that staying in the one position for too long must bore me or make me uncomfortable because I tend to need to change position all the time... which is no easy task with a basketball for a belly!!! lol
I agree that taking naps when you can is probably the best thing you can do... if you fall asleep reading, watching tv etc, thats at least some sleep you're getting.