MTNR1B (Melatonin Receptor 1B): MTNR1B encodes one of the receptors for melatonin, a hormone that regulates sleep and circadian rhythms. This gene plays a crucial role in maintaining the body's internal clock and is also implicated in glucose homeostasis. Variations in MTNR1B have been linked to an increased risk of type 2 diabetes and disrupted sleep patterns....