Barnes & Noble NOOK Tablet User Guide 19Locking and Unlocking Your NOOKWhen your NOOK has been idle, your NOOK goes to “sleep.” Your NOOK darkens its screen to conserve power.It also locks the screen so that accidental touches do not perform actions.To wake up your NOOK, do this:1. Press the NOOK button (the raised NOOK symbol on the lower front panel of your NOOK).2. Unlock your NOOK.• If you have set up a four-digit passcode to lock your NOOK, enter the passcode. Your NOOK displaysthe last screen you were viewing.• If you have not set up a four-digit passcode, the screen displays a white NOOK symbol in a green circlenear the lower left corner of the screen. Press on the green circle and drag it to the right. Your NOOKunlocks and displays the last screen you were viewing.Drag the green circle with the NOOK logo to the right to unlock your NOOK.