In time travel NoSleep stories, they often break causality in interesting ways. For example, a character might go back in time and cause an event that they thought was the cause of something in their present, but then they realize that it creates a loop. It's like the event they caused in the past was actually caused by their future self in the first place.
Time travel NoSleep stories often play with causality by creating paradoxes. Let's say a character travels back in time to kill their own grandfather before their father was born. Logically, if they succeed, they should cease to exist. But in these stories, sometimes they don't disappear immediately. This creates a situation where the normal rules of causality are thrown out the window. The stories then explore how the character deals with this broken causality, whether they try to fix it or just accept the new, chaotic reality that they've created.
Well, many time travel NoSleep stories use causality as a source of drama. A person could travel back in time and try to prevent a bad event from happening. But in doing so, they end up being the very reason that event occurs. This is a common trope. It shows how complex the idea of cause and effect can be when time travel is involved. It makes the reader question what really causes things to happen in our world and how much we can truly change if we had the power to time - travel.