I need some advice.

Kirsten • Im Kirsten, & I'm a mommy to Jazmyne
My fiancé and I've been together 3 years this August and our sex life is totally different now. I'm 28 weeks pregnant and at night is when I get horny the most, (tmi sorry) and he always asks me why we can't do things during the day rather than at night. 
We stay with my parents so it's extremely difficult to even cuddle at night because my stepdad is ill and my fiancé helps take care of him, but now my 22 year old brother takes care of him as well, so I want time with my fiancé but I never get that. 
And I just want one night where my fiancé and I can have a day of watching movies and relaxing, is that too much to ask for? How do I get my fiancé to spice up our sex life at NIGHT? 😞 please? I don't know where to turn.