Gintama Episode 153: Sleep Helps a Child Grow
Episode 153 of 201 of Gintama, aired April 15, 2009, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Kagura can't fall asleep, so she goes to Gintoki's room and troubles him about her problem. After few methods, she finally fells asleep while listening to a story from a radio show. Unfortunately Gintoki listened to this Horror story as well, and now he can't fall aleep.