You're not the only one who is tired! No matter how much sleep I get or how I take care of my body, I am always tired. When I wake up in the morning I feel like I got run over by a truck. There are a lot of factors that combine together to cause fatigue, especially with crohns. Some people take B12 shots and they say they really help.
I always try to plan things in the morning, when I actually have a little energy. If I plan to go out in the evenings, I always have to take a nap first.
Have your doctor check for both types of anemia, if you are lacking in iron or B12 you can suffer from anemia. Prior to being treated for anemia, I always exhausted. Good luck to you.