You might have sleep Apnea. 8-9 hours a night seems high for a non-teenager and might be compensation for disrupted sleep which can kill your learning ability.

You might have sleep Apnea. 8-9 hours a night seems high for a non-teenager and might be compensation for disrupted sleep which can kill your learning ability. I am not a doc, don't play one on tv, ymmv, etc. Do a Google search and then talk to your doc.