baby sleeping but I'm not

My son has just started dropping down to one mid night feed. Sounds amazing right??? Except for some reason I can't get myself back to sleep after it! Currently laying here with my hubby and baby both snoring away and I either have to get up to pump or eat or pee and can't ever get back to sleep!!??? If I could have fallen back to sleep I'd be getting a good 7-8 hours per night and functioning well during the day. I got back to work in two weeks and then my naps will be nonexistent too. Help!!! How can I cure this insomnia? I've tried meditation, deep breaths... 😞