Sleep requires an extremely small amount of power—about the same as a nightlight. If your laptop battery charge gets critically low while the computer is asleep, Windows automatically puts the laptop into hibernation mode.
You can prevent unauthorized access by requiring a password to unlock your computer when it wakes from sleep. To change the password requirement when my computer wakes from sleep, follow these instruction:
To help secure your computer, Windows requires a password to unlock the computer when it wakes from sleep. It's a good idea to protect information by using a password, especially if there is confidential information on your computer—but, if you're the only one who uses the computer at home, and you don't want to enter a password every time your computer wakes, you can change this setting.
password is the password you use to log on to your computer. You can help keep your computer more secure by changing your Windows
password regularly and by using a strong safe password
Press Ctrl+Alt+Delete, and then click Change a password.
Type your old password, type your new password, type your new password again to confirm it, and then press Enter.
If you are logged on as administrator, you can change all curent users password. Don't forget to make a password hint.