Which substance can disrupt your sleep cycle aside from caffeine?

Alcohol is known to disrupt your sleep cycle significantly. While it may initially help you fall asleep faster, it can lead to fragmented sleep and reduce the amount of time spent in deeper sleep stages. This is due to alcohol's effects on the central nervous system and its impact on sleep architecture. As the body metabolizes alcohol, it can interfere with REM sleep, which is crucial for restorative sleep and cognitive function.

In contrast, melatonin is a hormone naturally produced by the body that helps regulate sleep-wake cycles, and is often used as a supplement to improve sleep quality. Valerian root is an herbal supplement often used to promote relaxation and improve sleep, while magnesium is a mineral that can have a calming effect on the nervous system and also support healthy sleep. These substances generally do not disrupt sleep; rather, they can support a healthier sleep pattern. Thus, alcohol stands out as a substance that negatively impacts sleep quality.