In part one (The Hearth and the Salamander) of Fahrenheit 451 Mildred (Guy Montag's wife) takes an over dose of sleeping pills. Mildred survives this only because Montag calls 911 in time, but the next day when he questions her about the night before she denies ever taking the pills. There are two possible explanations for this. Either she WAS attempting suicide and was denying it just to assure Montag that everything was fine and she wasn't unhappy, or since Mildred is always listening to the seashell and watching the TV (or talking to the family) she might be so brainwashed that she forgets what she was doing the moment before. IE, taking two pills then another two then another two just because she forgot she had already took two pills.
(I would appreciate your input on the subject)