Two Natural Sleep Aids Face Off in New Research

Health Points

• Melatonin works best when your body needs help resetting its internal clock.
• L-theanine promotes calm without the next-day grogginess many people experience with melatonin.
• Choosing the right supplement depends on whether the goal is to fall asleep faster or simply relax before bed.

Millions of adults over 40 now reach for over-the-counter sleep aids when counting sheep no longer works. Two popular choices, melatonin and L-theanine, each promise better rest but work in different ways. Understanding those differences can help you decide which option fits your nightly routine.

Melatonin is a hormone your body naturally produces when darkness falls. Taking a small dose of the supplement can signal that it is time to wind down, especially if you have crossed time zones or switched to an earlier bedtime. Research shows it shortens the time it takes to fall asleep by roughly seven minutes for most users.

“Melatonin is most helpful when the body’s clock is off,” says Dr. Elena Vargas, a sleep specialist at Mayo Clinic.

L-theanine is an amino acid found in green tea. Instead of telling the body it is nighttime, it raises calming brain chemicals that ease racing thoughts. People who take 200 milligrams about an hour before bed often report feeling relaxed without feeling sedated. Unlike melatonin, L-theanine does not appear to change the timing of your sleep cycle.

“Many of my patients prefer L-theanine because they wake up clear-headed,” notes Dr. Michael Thompson, a family physician in Portland, Oregon.

Side effects are rare for both supplements when taken at standard doses. Melatonin can sometimes leave users feeling drowsy in the morning, while L-theanine may cause mild stomach upset in sensitive people. Experts recommend starting with the lowest effective dose and using either aid only when needed rather than every night.

Creating a consistent bedtime ritual that includes dim lights, cool temperatures, and no screens still offers the biggest payoff for long-term sleep quality. When supplements are part of that routine, matching the choice to your specific sleep challenge is the key to waking up refreshed.