Are we talking actually napping here or going to bed for "ahem" other reasons?
If naps, then I agree with Expat. When I was pg, I could not survive without a nap every day, even when I was alone with toddlers in the house. They had to watch videos or play alone as I would pass out if I didn't lie down and sleep.
Not being pg anymore, no, I don't feel the need for naps anymore.