Don't put a fast charger for overnight charge. It degrades the battery. I got my charger hooked up to my server's usb port and it's able to charge a 10000mha battery overnight at nearly 100% from low percents.
Battery degradation is caused by extreme temperatures right? There is no way a fast charger will make your phone warm enough to cause any meaningful damage. (80% confidence)
Extreme temperatures AND high C (coulomb) rates. Not really a problem on most smart phones. But you'd have to charge from 0-100% in under 20 minutes (above 3 coulomb) for that to become a real problem
My beagle insists on being little spoon at night, so I hug him until he starts dreaming and jostles me awake. Then I make him move to my feet because I can't stand how he moves when he dreams while I'm also trying to sleep lol
This depends heavily on the laptop hardware and the activities, both of which you referenced.
If you have a need for being surrounded by four laptops in bed, it seems likely you're already exceeding standard cooling requirements in some direction.