Not waking up from sleep - how to troubleshoot help request

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Standby/Suspend

journalctl --boot -1 | sed -n -r "/Starting.+Suspend/,/Finished.+Suspend/p"

Sleep/Hibernate

journalctl --boot -1 | sed -n -r "/Starting.+Hibernate/,/Finished.+Hibernate/p"

Here you can get a list of all boots with date and time:

journalctl --list-boots --no-pager

Then you can target the correct boot number (0, -1, -2, -3 etc.)