Maladaptive Daydreaming: where wild minds come to rest
Number 3 is fairly normal if you're mentally exhausted. It happens to me when I'm about to fall asleep and really tired. I hear random dialogues in my hear or see weird images and I literally lose control over my train of thoughts. As much as it sounds odd or frightening, it is normal and nothing to worry about. It's probably related to alpha brainwaves and it's caused by tiredness or sleep deprivation or stress.
#3 sounds like hypnagogic hallucinations. They usually occur just before or after you sleep. It can be like swirls of colour or sounds and voices. If you are really tired then that could be why they are occurring.
I'm not entirely sure what you mean by the other two to be honest.
No, they are not hypnagogic hallucinations. They are classical racing thoughts which occur as you approach alpha brainwaves and at this point, you're still awake and can tell that voices or images are fully inside your head. This is quite common when people have fever because of the exhaustion. Hypnagogic hallucinations, on the other side, occur when you're neither awake nor asleep and you think that what you're experiencing is real before suddenly going fully awake. Happened to me once, and heck, it was scary as hell because I actually heard the voice saying totally evil stuff to me, hahah. Luckily, I knew that it was a hypnagogic hallucination and that it was quite normal, otherwise I would've been traumatized for the rest of my life, hahah.
Ah okay. Fair enough. You have a lot of knowledge when it comes to brainwaves lol.
I think I've had a similar experience to #1 but it happens fairly rarely (maybe once a month). Like I'll get something stuck in my head that isn't a song. Sometimes a word or a short phrase or sentence but never as elaborate as a commercial.
Hypnogogia happens all the time when falling asleep and other times when very tired.
I experience similar things quite frequently.
#1 is usually sounds more than anything else, and I don't usually notice until it feels like someone is yelling directly into my ear, though, like you say, I'm not actually "hearing" anything and I'm very aware that it's only in my head, but sometimes it takes me by such surprise that I actually turn my head to look for the source before registering that it was simply a "loud" thought.
Generally for #2 there isn't any conversation involving me happening, it's like I'm listening to background characters have a conversation without me, though there aren't any real words being used.
And with #3 it's the same as everyone else, where it occurs when I'm really tired or as I'm going to bed.
Number 1: Same thing with me! This started happening a lot when I cut down on my daydreaming. Are you trying to quit? Maybe it's really your brain, which is used to constantly creating stimuli, trying to keep doing it even when you're forcing yourself not to DD. Anyway, that's what I think is happening to me. Dunno about 2 and 3, though.
Sometimes I had #1 last semester. It was usually when I felt overstimulated by stress, my roommates, music, etc. I also used to be much more active and enthusiastic as a child. Now I am more calm and quiet. I was trying to get back to my happy randomness by doing #1. It felt unnatural so I stopped. I do #2 mostly between classes or when I don't have a lot of time to daydream.
I can relate to both #1 & 2, though not exactly in the ways you've described them. As far as #1 goes I understand and relate to the part of not being in control and your mind just sort of doing its own thing. Most of daydreams are not controlled. They simply occur and progress however they want. I generally don't have an input. Also, monotonous tasks tend to trigger my dreams as well.
For #2 I don't have "half-daydreams" often, but they do occur and blend reality with my dream world. When this happens I can usually watch something happening seemingly before my eyes, only to realize that it was just a dream blending the lines of reality and dream together. This has been happening progressively more often and mostly with birds when they're walking around in front of me.