Sleepiness while on implanon?

I got the implanon birth control inserted April 2011. The only major changes/side effects I had in the first year were irregular periods & weight gain/loss. Also my arm would get tingly sometimes. I at first got my period at random times, sometimes twice a month, with it lasting 2-3 days or 2-3 weeks. After about 6 months, I wouldn't get my period at all or once every 3 or more months, lasting 2 days to 2 or 3 weeks. (I got my period once, maybe twice this year, I can't remember when, but they lasted about 2 weeks.)

With my weight, I'd lost about 20 pounds in the first 6 months I believe, then since then, I would gain and lose 10 pounds, which is no biggie. I'd actually just lost ten pounds recently. Perfect timing for Christmas!

A new side effect I'd noticed since maybe 2 or 3 months ago is that I am SUPER super tired. I could fall asleep at 10pm & not wake up until (the latest) noon the next day. It seems that no matter how much or how little sleep I get, I am always tired. I do know that I am anemic, and that it could be what's causing it, but I've been having anemia issues for years and I've never felt this sleepy. I haven't gone to my doctor on this yet because of it being Christmas and all, but I do plan on seeing her. I just wanted to see if any others were having sleepiness issues as well.

Was curious too, I can't find it anywhere on google: what exactly happens to our eggs while on implanon? Since I'm not getting a period but once a year, are they just building up until my body just finally releases them? I plan on asking my doc that too!