Staying up all night is filmmaker Karan Johar's mantra to get a dose of reality.

Karan took to Twitter to share his late night fundas. He posted: `Late night thoughts are your reality check.`

Meanwhile, the filmmaker is busy with his next project "Ae Dil Hai Mushkil" which stars Aishwarya Rai Bachchan, Anushka Sharma and Ranbir Kapoor. The film will release on June 3, next year.