Sounds OK to me! Some babies sleep more than others. Luckily my DD has almost always slept all night. The odd time she didn't sleep through was often for some unobvious reason (a light on, a light off, window closed, window open, door open, door closed, too hot, too cold, hot milk, cold milk) you get the idea. I'm pretty sure that we didn't find the cause of many of her wakings but we tried changing the odd thing and it seemed to work. Maybe it will for you? try "being her" you may see, feel, smell or sense something you didn't expect.
Hope this helps,
Andy