Sleepless and heartburns at night

Hi! I’m 25 weeks today and tonight I can’t seem to fall asleep. My bump is quite big now so I have to lie down on my sides instead and I constantly have to put a pillow or blanket under my bump or else my belly feels so uncomfortable. Usually after I put a pillow, I’ll feel okay but today every position that I sleep is just wrong. My belly feels uncomfortable. And I have heartburn. And I’m wide awake at 2am and I’ve to be up by 6am for work. Any suggestion?