Sleeping, is it normal to sleep..

Thamara • Mom to Ollie age 3. Pregnant with number #2

Is it normal in second trimester to sleep about 12 to 13 hours a day?

I can sleep 8to9 at night, wake up do some stuff and then crash again for another 3to5?

This is happening for me 2to4 times a week. Some days I'm fine with just 8 hours other times the nap is needed.

I'm 22 weeks.

Opinions ladies?