Can anyone tell me why my new macbook air reboots overnight?

If I leave my macbook air on overnight (so I can complete a timemachine backup) I find that when I get up in the morning my mac has rebooted!
I have checked my preferences, in the battery section, under schedule, and I do not have a scheduled reboot in there! (Do I need to check anywhere else?)
Its frustrating as all my ssh sessions I've logged into are now gone every morning. I am used to them being open for weeks on end.
Thank you for any help
Matt.

Champion thankyou!
Clicking advanced in the security and privacy showed me the option to logout after 60minutes of inactivity. Now that is unchecked. I assume this will work overnight, but we shall see
Thanks again!
Matt.

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