A good home remedy for getting rid of your dark spots overnight is to take a lemon and cut it in half and squeeze the lemon juice out of the lemon into a cotton ball and apply the lemon juice to the dark spots.
Leave the lemon juice on the dark spots for 10 to 15 minutes and then wash the lemon juice off after the 10 or 15 minutes have passed.
Do this a few times per day and your dark spots should start to disappear overnight.