Please use these two commands (sudo alone only gives you admin rights for the first command):
$ sudo -s
$ sync; echo 1 > /sys/power/pm_trace; /etc/acpi/sleep.sh force
(note you will need to reset your clock after reboot)
Thank you for this
Jérôme Guelfucci: Sorry, I thought the idea that g-p-m was triggering at the same time suspend and hibernate was a good hint. There may be two independent issues here too.