NSFW- How come I'm having two-fers lately?

I think “Solve a Problem” is inaccurate for this question.

For the last two months or so, every time I have sex and have an orgasm, I wake up the next morning having another orgasm. My husband and I only get around to it once a week or so anymore (huge fetus in the belly between us) so it’s obvious that it’s not coincidence- it’s every time, and doesn’t happen in between.

What’s that about? I though nocturnal orgasms were reserved for sex deprivation… this doesn’t seem to be the case. I’m not complaining, just curious.