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.
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details