Is it normal to feel fatigue and sleepy during 20 weeks pregnant?

I think each pregnancy is different. Some prefer to take afternoon naps. For me, I have to sleep for at least 10 hours at night, i.e. 7:30pm - 5:30am. Do what your body desires and have plenty of naps if it works for you.

It is just normal. Soon will be better. It is just hormonal changes in the body hence some mummy gets easily and fatigue.