If you have recently upgraded your computer to Windows 10, you might be facing a problem where Windows doesn’t ask you for login password when resuming from sleep or hibernation. This is even when your Windows 7/8.1 before upgrade was prompting for password while starting from sleep. There seems to be some settings that get changed after Windows 10 upgrade, and hopefully we may see a fix from Microsoft in nearby future, but for now there is a solution to this problem.
1) Go to All Settings from Action Center and then click on System.
2) Click Power & sleep and then click Additional power settings.
3) Click Require a password on wakeup.
4) In Password protection on wakeup section, you will see that the setting is changed to Don’t reuire a password. This is the reason Windows 10 is no longer asking for password at login. Require a password (recommended) should be check on, but it is grayed out and you are not able to do any changes.
5) Click Change settings that are currently unavailable.
6) Now you should be able to select Require a password (recommended). Select it and click OK.
Put computer to sleep and wake it up, you should now be able to see the login screen.