Washington, Jan 7 (Inditop.com) US First Lady Michelle Obama reveals that the stress of being president may be getting to Barack Obama, reports the dailyexpress.co.uk.

“When he is really sort of brooding about something, it’s late at night and there is a lot of little note-writing going on� that’s when I know,” Michelle, 45, was quoted as saying.

She also said that the secret to their successful marriage was to keep their troubles behind closed doors.

“The truth is that everybody struggles with it – we just don’t talk about it,”dailyexpress.co.uk quoted Michelle as saying.