Are there different levels of consciousness?

I know there are different states—asleep, awake, meditative, drug-induced, etc. But what I’m wondering is if there are different degrees to which you can be in any of those states? (Mainly in being awake… I hardly take medication, and I’m not concerned about when I meditate or sleep)

And this may be a way dumb question. But I’m wondering because I’ve worried some people around me. According to them, it’s like I’m different people at different times… but I’m not totally aware of it, if at all. Sometimes I don’t feel any different, but I act completely different. I’ll go from talkative and energetic and expressive to blank-faced, “empty-eyed” and near silent. They’ve told me. They’ve asked me about it. And when they point it out, I notice the difference in feeling inside, and it kinda scares me a bit… But I don’t know what to do about it. They’ve told me it’s not normal. “It’s not normal to be completely different people”...

One time I was driving and barely aware that I was doing so, I guess, I don’t know… I remember trying find space to move to the lane on my right. Then suddenly I heard a horn from somewhere, and the person in my passenger seat shouting out my name… I had completely gone into the lane on my left without realizing. And it was only after that shook me up that I was aware at how hard it was to focus on anything, or take anything in.

I guess it’s that I feel like sometimes I’m more conscious than other times? Sometimes everything in life is sharp and clear and bright, sometimes it’s fuzzy and confusing and distant. But I’m not usually aware that I’m feeling so different until someone points it out… Is that normal? Or are the people right, that it’s not?

I’m asking because I know I have a tendency to make more out of things than is really there. Am I doing this here, worrying about nothing? Or should personality, or whatever it is, not vary that much?