If you're a single person who lies awake at night pining for someone to come and relieve the ache of eternal loneliness, then you can cheer up a little, maybe, knowing that the alternative might be worse. Getting shot by Cupid's arrow can actually make it more difficult to fall asleep at night, thanks to the explosive chemical reaction that love causes in your brain.
Also, due to the massive blood loss. It's an arrow.
Studies on couples in the honeymoon stage of their relationship have shown that, even when hooked up to decidedly unromantic fMRI brain scanners, people in love record decreased levels of serotonin and increased dopamine. Serotonin is the chemical that tells our brain that we are relaxed, content, and fulfilled. Dopamine is the chemical that screams, "HAVE SEX NOW YES, GO GO GO, SLEEP BAD, SEX GOOD, SEX NOW YES!" In short, your brain on love is frantically trying to suppress your sleep instinct to allow more time for boning.
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"I try to hook you up and Ambien is the thanks I get? Good luck remembering her birthday tomorrow, asshole."
But it goes deeper than that. If you're sleeping beside someone (whom you presumably care about) who has trouble sleeping, then you also run the risk of developing sleep problems yourself. It's more than just having to put up with your spouse's constant screaming night terrors. Studies were done on couples where one experienced chronic pain and therefore had trouble sleeping. What they found was that the spouse tended to have more trouble sleeping, simply out of empathy. Aw, that's kind of romantic.
"Don't worry, honey; I won't let you be miserable al- oh you're asleep."
The study also showed that, the closer the relationship was, the more trouble the spouse without pain had getting to sleep. And that's not to say that the suffering spouse suffered any sleep deprivation due to their partner -- all of the negative sleep effects were on the partner who didn't have to deal with debilitating pain. Damn, between this and the full moon thing, the people in all those werewolf-based porn novels aren't getting any sleep.
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Also check out 4 Disturbing Sleep Conditions No One Talks About and 7 Basic Things You Won't Believe You're All Doing Wrong.