
You might be confused by the title of this post, you might be thinking, “I thought that when I close the lid, my computer just goes to sleep and that was that.” , well you’re right. But what you may not be aware of is the fact that there are 2 types of sleep: sleep, and hibernate.
Sleep mode stores your system state on your RAM (this requires a minute amount of battery/power to keep it going). Hibernate stores your system state on your hard disk and does not consume power, but when you open your lid, it takes longer for your computer to start up.
The default setting for your computer (not changeable without this application) is sleep and hibernate. I have concluded that this means your computer will sleep for a certain amount of time, but if you don’t come back in a while, it will hibernate (because when I leave my computer for a few hours, god forbid, it takes like 30 seconds for the unlock dialog to appear).
SmartSleep changes this by letting you choose what you want your computer to do. It lets you choose whether you want it to hibernate exclusively, sleep exclusively, sleep and hibernate (system default), or smart sleep.
Smart sleep mode makes it so that your computer will sleep until it reaches a certain level of battery (default is set at 20% remaining). When it reaches this level, it will automatically go into hibernate mode.
Forcing your computer not to hibernate can save a lot of time, but keep in mind that sleep mode does drain a little battery, so if you’re going on a plane or car ride, hibernate only may be a better choice.
[Product Page: Jinx] via [Lifehacker]
Note: I do not recommend sleep only mode. If your computer runs out of batteries while sleeping, it could damage your hard drive among other things