A woman who has already lived out more than half of her life lies next to her man, listening to the night sounds of their own breathing, and has intimations of mortality. She thinks of her own mother, who was already dead at this age, and feels she must conserve her very breath. The sexual energy and "soft expensive murmurings" she spends on her lover may cost her--and yet he is oblivious, sleeping "as if there could be even now / no question of tomorrow."