|No serious side effects have been reported in association with taking melatonin. Non-serious side effects are uncommon. Some individuals who are sensitive to melatonin may experience drowsiness during the early morning hours. This effect is usually dose dependent, meaning that higher amounts of melatonin may intensify this effect. Read the label to ensure proper usage of SleepTrim. Always consult your physician before starting any new supplement. Individual results may vary.