The phrase "gray of the dawn" is a picturesque and evocative way of describing the early hours of the morning, when the sky is often pale and muted. There are a variety of synonyms that can be used to convey a similar sense of atmospheric quietude and stillness at this time of day. These might include terms like "dusky," "misty," "hazy," "pale," "subdued," "muted," "ashen," "crepuscular," or "shadowy." Each of these words can be used to conjure a slightly different image or mood, but all share a sense of quiet and introspection that is characteristic of the early hours of the day.