Milk is often preferred at night due to the presence of specific compounds that may help promote sleep.
The Science Behind Milk and Sleep
The preference for milk before bed is often linked to its ability to help some individuals fall asleep more easily. This is largely attributed to the following:
- Tryptophan: Milk contains tryptophan, an amino acid that plays a crucial role in the production of serotonin, a neurotransmitter involved in regulating mood and sleep. The reference notes: "Tryptophan is an amino acid found in a variety of protein-containing foods. It plays an important role in the production of the neurotransmitter known as serotonin ( 6 )."
- Melatonin: Milk also contains melatonin, a hormone naturally produced by the body that helps regulate the sleep-wake cycle.
These compounds, working together, can contribute to a more restful night’s sleep.
How Milk Aids Sleep
While not a cure for sleep disorders, milk can be a helpful tool for some due to its specific components. These components facilitate sleep by:
- Serotonin Production: Tryptophan in milk is converted into serotonin in the brain. Serotonin helps create a sense of calmness and relaxation, which are conducive to sleep.
- Melatonin Support: The presence of melatonin in milk supplements the body's own melatonin production, further reinforcing the signal to the body that it is time to sleep.
Other Factors
While the components in milk are the primary reasons for its sleep-inducing properties, other factors can also play a role, such as the warmth and comfort of a warm glass of milk before bedtime.
| Compound | Function |
|---|---|
| Tryptophan | Precursor to serotonin, which aids sleep |
| Melatonin | Regulates the sleep-wake cycle |
