I'm not sure when this happened, but at some point during the past four years, the song that the FISHER PRICE AQUARIUM plays has been a source of soothing for me when I sleep.
I'm sure that it started when my oldest finally learned to turn it on and used it to soothe himself back to sleep. The change from "Oh crap the baby's up" to "oh, the baby turned on his aquarium.....I can go back to sleep." was pretty dramatic. I love the song. I don't know what the tune is - something proprietary or a Standard that they're using. But it's like being asleep in a cave where Vangelis is performing.
Not really the most calming of metaphors to some people I'm sure, but it does relax me.
The twins have started adjusting the volume, so it can be a START to be jostled awake if Vangelis is performing at volume 10, but mostly it's calming. If they go from jabbering and making noise to turning on the aquarium and I know that I can roll over and go back to sleep.
Which is priceless.
Play on Vangelis.