For what it’s worth… both of you are going through this, even if they’re not aware of what it means. I think every runner we’ve ever had talk about the experience afterward mentions insomnia.
The runner thinks about you constantly, too - they just don’t understand the spiritual mechanics. When you’re lying awake obsessing over them, they feel that energy as intrusive. When they’re feeling guilty or trying to suppress their feelings, you wake up in distress. It’s a feedback loop. The duration varies a lot. For some, they get it for a few days, while others go through months of poor sleep. It usually comes in waves rather than being constant - peaks during energy upgrades, when either twin has a breakthrough, during gateway events like eclipses or full moons.
This should go without saying, but if it keeps happening, get yourself checked out with the doctor. True insomnia is no joke.
The intensity tends to be worse right after separation and during dark night of the soul periods. It generally improves when healing progresses and especially after the surrender phase. When the chaser withdraws their energy to focus on themselves, both twins get energetic relief. The runner gets room to contemplate, and the chaser stops draining themselves.