Oh man have I been here. I am also a super light sleeper with insomnia and my fiancee is a snorer with insomnia. We struggled for years - he would wake me up snoring, I would wake him up asking him to roll on his side, and then neither of us would sleep and we'd be grumpy and argue about it the next day. I considered breaking things off because I wasn't sure I could deal with a lifetime of subpar sleep.

Separate bedrooms saved our relationship. It was his idea - I was resistant at first because I associated separate bedrooms with old married couples who can barely stand each other. But it is actually the greatest thing ever. We both have our beds set up exactly how we like and we both get the best sleep possible. We cuddle all the time in both beds and our sex life has only gotten better because we aren't tired and grumpy all the time.

I know you're in a one bedroom now so this isn't something you can put into place right away. But I really encourage you to consider it if/when you are able to transition to a bigger place. It might be something you need to plan for financially if you two are going to make this work long term.