Try not to worry Seth is the same. He'll sleep great from 8:30 pm till 8 am (he wakes between 4-6 am for a feed then back to sleep) sometimes he'll even go back to bed till 10 am but after that its up and down like a yoyo. I personally would rather it this way as it means I get sleep at night. My first slept really well during the night but didn't sleep through till about 8 mths and I seem to manage mentally better this way Although come arsenic hour (5 pm) I do tend to get a bit highly strung LOL!

*hugs*
Cailin