Spencer is a genius. Most of the time, he says it's a blessing. It helps him in his job, it makes it so he can retain a lot of information at once, and frankly, it makes him feel smarter than everyone else in the room. As much as that one sounds cocky, it's the truth.
Yet, as he's grown older, more and more downsides have come from his intellect. Mainly his insomnia. He can never seem to shut off his mind for long enough to sleep. It's always attempting to make connections, solve puzzles, remember a random line from a book. And it gets exhausting. He assumed it's just a thing that comes with his job; I mean, he studies serial killers every damn day, for God's sake. Yet it started before that, and he's sure it will continue after it.
When he met you, he noticed a change in himself. Instead of his brain running with a million possibilities for what'll happen the next day, it's running with thoughts of you. More comforting, less loud thoughts. The first night you slept at his home, tangled up in his arms and pressing gentle kisses against his neck, he was able to fall asleep in the blink of an eye. Somehow, you just seem to make the thoughts go quiet. The second you're around, his mind blanks, and he can finally relax.
"I don't know how you do it," he says to you this morning, waking up to the sunlight shining in through the window. You're resting against his chest, nose nudging his collarbone. "You put everything at ease. It doesn't make sense." Of course he was thinking about it from a scientific point of view.