I don't know if this will help because some people are against letting their bubs cry but I was suffering from the same thing - 45 min naps - about 3 a day. After going to sleep school I've leanr it is vital for her to have more sleep than 45 mins - she is much happier when she does.

If she wakes after 45 mins (even if she looks wide awake) I need to resettle her. If she is talking or awake happy - then just leave her. If she cries then I go in and pat the bed or stroke her lightly. She has fallen back asleep after this. It now means she can sleep by herself longer than 45 mins and she is much happier and sleeping through the night better. I've learnt that helping her now (with a few tears ) means she will get better sleep.

I hvaen't found her to be hysterical and becaus eI;'m watching for her tired cues she is in bed much quicker (sometimes after 1 hr). I thought she could be up as long as 2 hours byt most times she gets tired before this so I put her to bed earlier - this is all working nicely!