You may want to look around at some of our other SS's...see if you can see the pattern in Luci's SS...she's got a pattern alright...not the one I'd like, but it's a clear pattern...
I don't really think you have enough data at various times...plenty of data..but not for long enough...is it possible to get BG's at different times of the day/night?
I agree with Wendy, it really helps to standardize your SS...it's easier for studying IMHO...