Are you leaving the laptop power unit plugged into the laptop and switched on at the mains socket or just running the laptop from its battery when in sleep mode?
It could be that the battery is running down when in sleep mode.
Best Black Friday Deals 2017
Black Friday Deals for Designers & Artists: Adobe, Apple, Corel Painter, Microsoft Surface, Wacom &e…
Best Black Friday Apple Deals 2017
Black Friday 2017 : date, sites participants & bonnes affaires