Feels like tremors. Once. please advice.

Hi I'm 41. I have no history of diabetes or bp. My health is pretty normal. I take a betablocker mild dose for tachycardia in the morning. My blood efforts recently were normal. Slightly high cholesterol and hba1c at 6.1. All else is fine. I have this weird feeling of the earth/bed shaking on some days right before I go to sleep or am tired. It's like there's an earth quake happening when I close my eyes. It lasts for a few minutes and goes off. This does not happen everyday but some days. My body does not shake. I don't feel any tremors in my body. I just feel like the bed is vibrating. When I open my eyes and check it slows down and disappears. I'm not sure how to explain this. I do have a lot of stress at home and I'm not sure, but it feels like my brain is making me feel the vibration. Any thoughts on this. I'm a Lil worried about this as yesterday this happened more than once. Please advice.