Husband doesn't let me get extra sleep

My pregnancy was going pretty smoothly. When my last Trimester started i feel really very sleepy and tired, throughout my firat and second Trimester i felt very energetic. My husband doesn't accept it. As soon as he leaves the bed, he wants me to wake up with him. When I get annoyed he says he is doing all this for me, I should walk as much as possible so I can have a normal vaginal birth. Yesterday he made me walk atleast 8km with some small breaks and I felt like I will die. I don't know what should I do to make him understand.