Hi and sorry to hear about this problem. Fefol and iron are found in most things that we eat. Feeling sleepy after consuming these is very very unlike. However, because many other ingredients go into drugs preparation, i may rather want to suspect some of these ingredients. In this case, I will suggest that you change the formulation that you are taking. Buy iron and Folic acid that is made by another manufacturer and try it. If the problem persist, you may want to consult with your doctor and find out what could be the likely cause. I am happy to hear that you donate blood every 6months. This is a highly welcomed and encouraged attitude. keep up, blood saves lives...... Hope this information helps or at least provides some guidance on how to proceed. Feel free to come back and know we are happy addressing your worries. Hope you get to sleep less.....