Every night, around 3 or 4 am, I wake up and jump out of bed thinking I hear my mom calling me. I wake up suddenly, zoom into her room and see that she is sound asleep. It's been happening every single night for like 2 weeks. I go back into my room and see that my covers are on the floor. I threw them completely off of me to get up as soon as possible. Happens every. single. night.
Good luck -- you need your sleep as do we all).
Have you thought of trying a baby monitor? - the listening bit in your mother's room, the receiver in yours. If you wake up and can just recollect yourself enough to listen before you jump out of bed, it might save you completely disrupting your night's rest.
As the waking is a recent development, it may also be a warning sign of burnout. When did you last get a real break and a real rest? Has anything happened with your mother recently that has made you more anxious about her?