For about 16 hours a day, my phone is somewhere between 100% and 0% charge, probably around body temperature or a little higher. For the remaining 8 hours, whi

For about 16 hours a day, my phone is somewhere between 100% and 0% charge, probably around body temperature or a little higher. For the remaining 8 hours, while I'm sleeping, it's at close to 100%; which is not ideal. I'd be curious how effective an overnight charging scheme would be that charges up to 40%, then holds it there until say 4 a.m. (or some other time based on the phone consumption, capacity and charger output) then charges up to 100% so that when you wake up it's fully charged.