Maybe some Microsoft Devs can publish a book about all the secret regedit hacks they use to make it function for themselves. I think Dave Plummer or another Msft vet mentioned you can remove hibernate & get 25GB back on your hard drive.
You can get even more of your hard drive back by limiting the size of Windows' page file.
I'm actually a big fan of hibernation on laptops and have mine set to suspend for 5 minutes then hibernate. My real life usage battery life has been noticeably longer with this setup.
The UI switch is not particularly obvious, at Control Panel → Hardware and Sound → Power Options → System Settings