Waking up gasping for air... 37+4

FTM here! For the past 2 nights I only sleep about an hour before I wake up gasping for air. I've been a side sleeper all pregnancy and my heartburn has gone away since the baby dropped. I'm so tired and I can't sleep without feeling like I can't breathe. I'm 37+4, has anyone else experienced this? I'm freaking out and I'm exhausted.