To answer the question posed in the thread topic, what gets me into contemplating self-bondage scenarios seems to be insomnia. I mean accumulated lack of sleep, not trouble getting asleep.
For some reason, lack of sleep correlates with self-bondage related ideas springing to the mind, and usually leads into such experiments and sessions.
For example, just now I was contemplating the idea about combining three things that you can do with pantyhose:
0) use glue or condom or whatever device you prefer to ensure that you won't cum into the garments. Optionally, dress in whatever tight garments you prefer at this point, set up plugs and gags and whatelse.
1) slide your both legs into one leg of pantyhose (that has feet), and pull it tight. Tie a belt around the waist, to ensure that the pantyhose stays in place. Do whatever you want with the remaining pantyhose leg. If the surface of these tights is low-friction, this should help step 3 a great deal. In any case, it will make step 2 considerably harder to undo (and to achieve).
2) take another pair of pantyhose, and make the inverse
pantyhose straitjacket. That is: tie the pantyhose feet together, slide your arms into the pantyhose legs, and pull the pantyhose crotchpiece behind your neck, and then loop the pantyhose legs around your waist sufficiently many times (two or three) until it is very tight, making sure that your arms will be on your backside rather than on your frontside. Note that step 2 is significantly more difficult to achieve if you did step 1 than if your legs are still separate. Optionally, before step 2, wear an additional pair of small pantyhose on your arms to make the pantyhose mittens. So far I haven't done this optional step, because you need a very precise children's size to make it useful (tight). Or you can use
sock mittens.
3) take a large third pair of pantyhose or some stretchy exercise pants, and make the
pantyhose sleepsack, which is next to impossible to achieve without the help of your hands, especially around the shoulders. If you did step 1, you can use leggings or any footless stretchy pants. Otherwise you should use pantyhose that has feet, because footless pants tend to crawl up to the knees. It isn't such an enjoyable scenario after all, if you can still walk... The point of step 3 is to make step 2 impossible to undo without undoing step 3 first. And undoing step 3, once you get beyond the point of no return, with your arms tied on your back and feet tied together, is probably a long, long challenge. And if you also use a gag, teeth won't be much help either.
4) once steps 0-3 are completed, start thinking of your escape plan, but first enjoy the predicament 😉
Has anyone else noticed such a trend in their own behavior? Looking back, I realize that this has been the case for me even in the childhood.
(Editor's note: I did not perform the scenario I presented here, yet. Just writing about it was enough to satisfy me this time.)
(EDIT: I did now. As expected, step 3 was tricky in both directions. Luckily the straitjacket set up in step 2 had enough slack in it to allow the right movements in order to escape.)