Breathing troubles at night

I’m 34 weeks (35 on Thursday) and for the past week I’ve felt like I’m getting less oxygen while I’m sleeping. I will wake up in the middle of the night (to use the bathroom) and feel like I’ve been breathing very lightly. I never have to gasp for air but I feel like I’m breathing the bare minimum. I’m not sleeping on my back. Also another thing I dealt with yesterday was feeling like my equilibrium was off. I wasn’t truly dizzy or nauseated but I just felt wobbly. Today it is pretty much gone, but idk. I’m just weirded out by these things happening.