I have a 13-in Macbook Pro (mid-2012) running on El Capitan with 16 GB Ram. It was fully charged so I unplugged the charger and put it to sleep without closing it. I came back 2 hours later and noticed the Macbook was hot. I woke it up and get a notification that it has low battery. It was at 5%. I plugged it back in and 10 minutes later it was at 25%. Can anybody possibly tell me why it was hot and battery so low while sleeping?