Naptime

Argh why is it that naptime is such a struggle? He knows it's naptime. He tells me he's tired. We go thru the whole routine only for me to have to go tuck him in (aka put the blanket over his head) over and over. Does he not understand Mommy wants to take a nap too? Mommy is 8 months pregnant and NEEDS a nap! We struggle with this for at least 30-40min every day. I even threaten to close his door if he doesn't stay in bed. I just put him down one more time. Let's see if it holds...