Microsoft has come up with some interesting research in this area. A laptop that is sleeping with power applied only to maintain what’s actively in RAM will typically draw 1 watt or less from the battery. The laptop will also resume in as little as two seconds from this state.
A laptop that is hibernated has written its memory contents to the hard drive and has shut down.The power draw is the same as having the device switched off, but the time to restart depends on the size of RAM installed and how long it takes to load the memory contents from the hard drive.
Hybrid sleep is a combination of sleep and hibernation. When the device is put to sleep, it writes the data to the hibernation file and then continues to keep the memory powered – for a while. If the user does not interact with the computer again within a certain time, hybrid sleep will allow the device to go into hibernation.
Shut down, of course, simply turns off the laptop, and the next restart is a regular boot-up from the hard drive.
In general, I think it’s makes the most sense to use hybrid sleep when (1) you know that you’ll likely be using the laptop again within an hour or so, and (2) when you’re uncertain that you’ll be back that quickly, but you’re sure it won’t be more than four or six hours.If longer than that, you can prevent the small drain that hybrid sleep provides by hibernating the laptop instead.
Finally, the type of sleep mode to choose should be influenced by your desired battery management. For example, my notebook is normally plugged in, and I have it set to recharge only when it drops below 88% capacity. It normally floats around the 90 to 96% mark when used at home, and this avoids unnecessary, unhelpful battery cycles. I routinely hibernate this machine except when I know that I’ll be using it again within an hour or so.