Acer aspire s3 Quick Manual page 13

Note: Once in Deep Sleep, your PC will consume significantly less
power compared with Sleep mode, but it will take a little longer to
wake up from Deep Sleep.
Deep Sleep and Sleep mode work together to ensure that your computer
saves as much power as possible while still enabling quick, instant on
access.
To save more power, your computer will typically enter and stay in Deep
Sleep during times when it will not be frequently accessed, for example,
during the middle of the night. To provide quicker access, your computer
will enter and stay in Sleep mode during times when it will be frequently
accessed, for example, during working hours.
Part no.: NC.M1011.04B
Ver.: 01.01.01
11