Worth continuing?

For a very long time now, my bed-side book has been Doris Lessing’s Shikasta, part of her Canopus series which she is said to rate highest of all her works.

However, I’m finding it immensely boring, and I normally don’t manage more than five pages before getting too sleepy to continue. 🙁

Is it just me? Is it worth reading on? Will it get better if I just get past a certain point? Or should I stop and pick a better book from our shelves?