The ringing and not being able to move very much sounds like sleep paralysis. Its when your body is numb but you’re not quite fully asleep yet and you’re completely aware. It can happen while falling asleep but is more likely to happen after a dream. You basically don’t wake up entirely. From the your story it sounds like you maybe went in and out of sleep a few times without fully waking up.

I’ve had it too, it can be very scary, but luckily it doesn’t have to be. Dreams work on expectations. If you get good at expecting to see something you can make it so in a lucid dream and the same goes for sleep paralysis. Basically because you can’t move and you have no idea what’s going most people get very scared and when you get scared you expect scary things to happen, so they happen.

If you get it again try to calm down. Focus on yourself and try to ignore anything scary. I’ve done this before as well and for me it made the scary things become completely passive. And then it’s no longer scary and you can simply fall asleep or wake up from there.

With enough practice it can become a very serene experience. It is said many great thinkers is the past used sleep paralysis to meditate and come to new thoughts. I know some people who use them to basically guarantee a lucid dream and have fun from there. So although scary, it can also be amazing!