Hibiscus tea contains compounds that may have caffeine-like effects, such as theobromine and theophylline. While these compounds are not true caffeine, they can still stimulate the central nervous system and potentially interfere with sleep.

If you are unsure how hibiscus tea affects your sleep, it may be best to consume it earlier in the day or limit your intake in the evening.

Hibiscus tea can interact with medications used to treat certain medical conditions, such as diabetes, anxiety, and depression. It can also interact with supplements such as iron, which can reduce the body's ability to absorb the mineral.

Hibiscus tea contains compounds that can affect the way the body metabolizes certain drugs. For example, it can interact with medications such as acetaminophen, aspirin, and diuretics, which are commonly used to treat pain, inflammation, and high blood pressure. 

Hibiscus tea can increase the effects of these medications, potentially leading to adverse side effects. If you are taking any medications or supplements, it's important to talk to your healthcare provider before consuming hibiscus tea.