Apparently insomnia is a family trait. My mother often lies awake at night. Her father (my grandfather) was a man of immense energy who routinely read until 1 or 2 a.m.I recall lying awake as a child, listening to murmurs of the television shows my parents were watching. As an adult I developed the sometime and uneasy rhythm of one night of wakefulness until 3 or 4 in the morning, followed by a night of a full eight hours’ sleep. I decided long ago not to lie awake in the dark. Instead I read or listen to music.