My brother had the 'nodding off' while driving issue. He found an earpiece that looks a lot like a blue tooth earpiece, but an alarm sounds if his head tips forward. I have the issue with nodding off at work, but I'm a notorious night owl. I barely get 4-5 hrs of sleep a night on most nights. Last night I couldn't sleep past 4am, but it's due to a stressful situation at work.
I did have a problem with anemia a few years ago. My levels were really low and I needed to bring them up before some surgery. I was sitting at an 8.5 but had to get to a 13+ in order for them to do surgery. I managed to bring it up that much through diet over about 3 wks. The tip off wasn't how tired I was (like dozing off), but was how short of breath I was and the lining of my eyelids were very white. I had never been short of breath before, and that's what got me to the doc.
The nurse who tested my blood said to try to increase my red meat, spinach and dark leafy salads (eaten WITH oj, citrus, or strawberries - they help with iron absorption - important with any non-animal higher-iron food), prunes, beets, dishes with kidney or black beans, and least 1x day take a couple of tbls of black strap molasses. By the time I went back for surgical admission, I was at a 13.4. Just enough that they didn't have to postpone surgery.
Also, if you do find you're anemic and need to take a supplement, you may have better luck with a liquid supplement rather than the pills. All the pill supplements that I tried seemed to 'stop up the works' and the liquid didn't seem to have as much of an issue with that.