Dealing with no energy and a toddler?

I'm currently 29 weeks with #2 and have just about enough energy to schlep myself from the bedroom to the couch.

Blood tests don't show anything wrong, but 9 days out of 10, I don't have enough energy to really get involved with my 3-year-old. Add to that the fact that my asthma has gotten so bad with this pregnancy that I generally can't go outside without using my inhaler several times (am waiting on insurance to approve a new inhaler that will help me with this) and we're generally stuck inside all the time (daddy works until late).

I've been trying to work around this by having family come over, but they can't be here every day, and my poor child is nearly dead from sheer boredom (doesn't nap and we don't do TV all day).

What are some low-energy things we can do that don't require me to leave the house?

Just to add, we do read, but she prefers to read to herself (can't actually read, but it's the thought that counts).