He later slept with women in the same bed but clothed, and finally, he slept naked with women. In April 1945, Gandhi referenced being naked with several "women or girls" in a letter to Birla as part of the experiments.[29] According to the 1960s memoir of his grandniece Manu, Gandhi feared in early 1947 that he and she may be killed by Muslims in the run up to India's independence in August 1947, and asked her when she was 18 years old if she wanted to help him with his experiments to test their "purity", for which she readily accepted.[30] Gandhi slept naked in the same bed with Manu with the bedroom doors open all night.