In Windows 10, I go to "Power and Sleep". You can pick you own settings for screen-off and sleep. I go with "Never" on sleep. I understand you don't want you fans running. I keep two browser windows (FB and this site) and mail open and minimized over night. I never keep a web site up that continually scripts and refreshes those PIA ads. If the fan runs, it's so slow I don't notice.
Our W10 machines don't have a hibernate option. At least none that I've found.