Objective To in ve stigate the difference of immuno-related gene expressions in T lymphocyte line (HUT78) incubated with melatonin by cDNA microarray of gene expression profile.

We suspect that suppression of melatonin may be involved in the effects of light at night on depressed affect.

Supposedly warm milk contains melatonin and trytophan and so helps induce sleep, but in fact, a glass of milk doesn't contain enough to have any effect. But it's still a soothing drink.