I have struggled with my sleep. I recently had a sleep study done at the sleep center. My oxygen levels are not great, but according to the test does not fit the qualifications as apnea. Usually, I sleep on my right side for about half the night and switch sides for the other half. I never take up the whole bed, unless I am not feeling well. Although that could be partly due to the fact that my cat likes to sleep on the other side of the bed.