Can you get too much sleep? And if so can this cause headaches?

As I’ve expressed on a number of occasions I’m a single mum with a 2 year old. I doesn’t sleep so good and is often up in the night a couple of times (be it briefly). So i’m pretty tired all the time.

I do however get to bed before ten 6/7 nights a week. I generally get him to bed between 7 and 8 and i get in bed then to read and I’m asleep by 9.30 at the latest…my eyes just won’t keep open when reading…

We wake up a couple of times in the night and then up at 7 generally and i’m waking up with headaches. They disappear mid morning but come back late afternoon. I’m wondering whether i’m getting too much sleep?

But why would i still fall asleep reading if this was the case…surely i wouldn’t be tired if i was getting enough sleep…. (maybe the reading thing is a different question?)