Day 0	Subjective (eligibility) and objective evaluation.
Day 1–7	Loratadine 10 mg upon waking in AM, placebo at noon, placebo at 6 PM.
Day 8	Objective evaluation.
Day 8–14	Washout period.
Day 14	Objective evaluation.
Day 15–21	Diphenhydramine 25 mg upon waking in AM, at noon, and at 6 PM.
Day 22	Objective evaluation.
Day 22–28	Washout period.
Day 28	Objective evaluation.
Day 29–35	Placebo upon waking in AM, noon, and at 6 PM.
Day 36	Objective evaluation.