Windows 8.1 on a laptop shuts down applications during sleep periods.
Windows 8.1 on a laptop shuts down applications during sleep periods.
Your friend's Lenovo IdeaPad U510 is behaving oddly at night, shutting down all open applications. It seems the issue isn't covered in the standard settings you've checked. You might want to explore advanced power management options or check for background processes that could be interfering.
Likely resolved in a software patch. Visit Lenovo's support page for details.