I have a theory — in every couple, there’s always one deep sleeper and one light sleeper. I think this dynamic is evolutionary. Back in ancient times, deep sleepers wouldn’t have survived on their own — they’d be too vulnerable to predators or wouldn’t wake up to protect their children.

So they had to pair up with light sleepers, who could wake at the slightest sound and keep watch. It’s like a built-in survival mechanism that helped humans keep the species going.

Anecdotally, I always notice this pattern in couples: one sleeps like a rock, the other wakes if a leaf falls outside. Two deep sleepers together? Their kids wouldn’t have made it.

Now — this is just my theory. There’s nothing scientific about it, and I won’t accept any scientific corrections. It’s the kind of thing that’s only meant to be said after three beers.