MacBook Pro shutting down when lid closed

I've seen this posted her a few times, but haven't found a conclusive answer. I installed Sequoia on my 2017 MacBook Pro and since then, when I close the lid for a prolonged period, the Mac just shuts down rather than staying in sleep mode. When the Mac boots, it doesn't ask me to choose which drive to boot from, so it isn't to do with that.

Does anyone have any idea why this would be? It's a bit of a pain, given it means I have to re-open everything each time I close the MacBook's lid overnight.

Thanks in advance for any suggestions!

submitted by /u/Mr_Fl0wers
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