Sleeping!! please help!!!!!!

So i can sleep all day doesnt matter where i am i can sleep i.e on city bus at work n the break room ...i know how dangerous it is but i cant stay up!!! its so hard and i get plenty of rest. When i was about 12 weeks pregnant i told my dr that i couldnt breathe in my sleep i was literally popping up out of my sleep cause i couldnt breathe so she prescribed me asthma medicine. Now its starting back and i still cant breathe at night im 33weeks and i feel like she just going to say take the asthma medicine when i know its nt working. I dont know what to do please Help