Estivation - a state of dormancy similar to hibernation, except it is used in the summer ...
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A computer in Hibernation mode can not do any activity, including downloading. Hibernation mode saves all information that was in your computer's memory to the hard drive and physically powers off.
Hibernation
It's not just set to overnight, it's set to a specific time. The basic setting is 30 minutes before a system goes into hibernate/standby. This can be changed in the power settings of your computer.
summer sprout
Your best bet would be to pull out the battery (which will force-power-off the system), then try to boot it. Preventing the problem in the future will likely require an OS update or a BIOS update.