The time of day you take zinc depends on your personal preference. Morning or evening, it's up to you to see what suits you best!
If you are taking a zinc treatment for its effects in fighting acne, it is preferable to take zinc on an empty stomach and away from other medications to limit the risk of interactions. A zinc cure for acne is based on taking 30 mg of zinc daily over a period of 2 to 3 months. Do not exceed the daily dose.
Moreover, as it is during sleep that the brain regenerates, it is at this time that zinc is called upon more. Therefore, lacking zinc can impact sleep quality.
Like magnesium, zinc contributes, in a certain way, to the transformation of melatonin, the sleep hormone. However, this hormone is mainly synthesized at night, which makes it the center of regulation of chronobiological rhythms. . It is secreted directly into the brain, by the pineal gland, when there is no more light. This is how melatonin triggers sleep. Therefore, it is often used to treat difficulty sleeping. Although there are very few studies on the link between zinc and sleep, some highlight the existence of a relationship between zinc consumption, the level of zinc in the blood and the quality of sleep. Across an entire population, individuals suffering from zinc deficiency had short sleep.
Source: https://www.inserm.fr/information-en-sante/dossiers-information/sommeil