I dont stutter when I 'forget' that i stutter.

I dont stutter when I 'forget' that i stutter. Like sometimes I would wake up and my mind would be occupied with thoughts of the long day awaiting me in college or whatever, and I would be speaking fluently without any problems until it suddenly hits me 'wtf? Why didnt I stutter' and then boom i begin to stutter for the rest of the day lol. sometimes when someone asks me a question out of nowhere or catches me off guard, I'd have no time to think of my stutter and I'd answer fluently, honestly these moments feel so good, anyone knows why this happens? Does Anyone experiences this too? And also when I was a child I had about 1 year period of fluency where I completely forgot that I stutter for a goddamn year, and then i remembered and i been stuttering since then.