Actress Alia Bhatt had to clean a desk for a week as punishment for sleeping in the school, she shared during an event on Children39s Day on Monday.The event was organised by an NGO Acorn Foundation which works to improve the living quality of the children who work as ragpickers and give the profession a legitimate and sustainable voice on waste management in Dharavi.Lending a helping hand in bettering the condition of ragpickers, the "Shandaar" actress, who is awaiting the release of her next film "Dear Zindagi", shared her funny memories from schooldays with the children."I was given a punishment to clean the desk for one week. This is because I did something which one should not do. I used to go to school and sleep in the bathroom. So one day the teacher caught me sleeping... Then I had to wipe the desk for a week. Very bad thing to do. So please don39t sleep in class, sleep at home," Alia said.Alia39s next, "Dear Zindagi" directed by Gauri Shinde, is scheduled to hit the silver screen on November 25 and stars Shah Rukh Khan and Angad Bedi. The slice-of-life film revolves around Kiara played by Alia, who is an aspiring cinematographer in search of a perfect life.Besides, Alia is currently shooting for "Badrinath Ki Dulhania" along with Varun Dhawan.