This May Be Why You Feel Sleepy After Drinking Milk - Tasting Table
Briefly

The tradition of drinking warm milk before bedtime is well-known as a means to promote sleep. Although scientific evidence supporting this practice is scarce, warm milk contains tryptophan, an amino acid associated with sleepiness. This compound helps produce serotonin and melatonin in the body. Other benefits attributed to this age-old remedy include milk's calcium and vitamin D content, which are thought to contribute to restful sleep. While ongoing studies seek to clarify these effects, the custom persists in many households as a soothing pre-sleep ritual.
Drinking warm milk before bed is a time-honored remedy thought to induce sleepiness, largely due to its tryptophan content, though scientific support is limited.
While the 'warm milk before bed' trick lacks extensive scientific evidence, its longstanding presence in bedtime routines is likely linked to tryptophan's sleep benefits.
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