Sleep Enigma - Help

I generally sleep for 8 hours, no more no less. I started tossing and turning more since my episode in April. I have also found that no matter what I feel like I could sleep all day. But last night I slept for 16 hours with my usual tossing and tuning due to pain. I sit here after only being awake an hour and a half of being awake and could sleep nore. Has anyone experienced anything similar? Any advice?