She can't sleep without him? That sounds... a little childish. We are grown ups, we are quite capable of sleeping alone, I assure you she will survive just fine.
Something to consider: I don't sleep very well in absolute quiet. If I don't have a fan or something creating steady white noise in the background my sleep suffers. I also like it cool, and rarely enjoy cuddling for more than a few minutes. Keep in mind that your partners are going to have their sleeping preferences, so to make things easier perhaps take a closer look at what they are and see if you can make your den of sin a bit more comfortable for them.
Me: male, 40, straight, single