The phrase "it feels best in the morning" can be described using several synonyms. Some options include "most enjoyable at daybreak," "most comfortable upon sunrise," "most refreshing in the dawn," or "most soothing in the early hours." Another option could be "most invigorating at first light," which implies a sense of energy and renewed vitality. Alternatively, one could use "most rejuvenating in the AM," which succinctly captures the time of day when the feeling is most prominent. Ultimately, the choice of synonym may depend on the context and intended tone of the message, but there are many options to convey the same idea.