Sleep Patterns?

I wonder — does Snapdragon have regular sleep patterns already? I think she might. For the last few days, I have been feeling her squirming around in there for several minutes at a time at four-hour intervals. Today, I noticed her at 2:00, 6:00, and 10:00. I'll have to keep charting the movements to see if the pattern stays consistent.

Let's hope it stays true right through birth. A newborn who sleeps in predictable four-hour blocks would be lovely.