According to WebMD, it says that the herb valerian has been used for centuries for sleep and anxiety. But it cautions …
“Side effects from valerian are rare but can include mild headache or stomach upset, abnormal heartbeats, and insomnia. Because of valerian’s calming effect, you should not take it at the same time as other calming medicines or antidepressants (or do so only under medical supervision). You also should not take valerian if you will be driving or need to be alert.”
Valerian has a sedative effect on the brain and nervous system.
Dr. Hyman mentions valerian in this YouTube video.
Valerian is not suitable for everyone or every condition. Check with your medical profession first. Valerian should only be taken short term and stop taking two weeks before any surgery. Do not take with alcohol. It can have interactions with other medications such as listed in medline — especially sedative medications.