Can sleeping too much be another sign of low iron?

Yes, as low iron levels or anemia can cause fatigue. This is especially true with women who have monthly release of blood. You could have a blood test done to determine if anemia is causing this problem. A simple check is to gently pull out the lower lid of the eye and see if the inner membrane is pale or pink.

Too much iron is also not a good thing. The best supplement in my opinion would be found in a health food store as I have had to take iron for short period of times. Certain types of iron are assimilated and others are not. (My son did an experiment with a cereal fortified with iron and he pulled out the iron from the crushed cereal with a magnet!!!)

Iron supplements are known to cause constipation. Cascara sagrada is a natural herb that is non-additive bowel toner that helps the peralstalstic action of the bowels and strengthens the intestines that might be good while taking iron supplement.