Definition of Stream of Consciousness
Woolf employs a stream-of-consciousness style of narration throughout To the Lighthouse as a crucial tool to manipulate the pacing of her narrative and slow it down to the speed of her characters' thoughts. Consider how Woolf follows Mrs. Ramsay's mind in the following passage, from Chapter 1 of "The Window":
If she finished it to-night, if they did go to the Lighthouse after all, it was to be given to the Lighthouse keeper for his little boy, who was threatened with a tuberculous hip; together with a pile of old magazines, and some tobacco, indeed whatever she could find lying about, not really wanted, but only littering the room, to give those poor fellows who must be bored to death sitting all day with nothing to do but polish the lamp and trim the wick...