Anyone else partner just don’t understand?

So I’m 38weeks pregnant and my partner has been the most supportive person the whole way through it, however the past week I haven’t sleeping at night because of back pain, babies still up my ribs and just general pregnancy insomnia which means I’m falling asleep at 5/6am and waking up at about 12 and I’m just beyond exhausted. It’s our first baby also. I’m starting to feel like she thinks I’m just sitting up all night because I’m on maternity leave from work and I can. She came home today and said ‘well maybe if you tried a bit harder you could sleep’. She just doesn’t understand that its not that easy. It’s really pissing me off because now I feel like she’s only getting annoyed because I’m not up cleaning all day like I used to do I just don’t have the energy. And like I said it’s only been this past week. I feel like she thinks I’m being dramatic when she doesn’t understand how hard these last few weeks of pregnancy are.