Peanut butter contains a great list of nutrients and many health advocates believe that if you eat it at night, you can soon feel the benefit.u003cbr/u003eu003cbr/u003eEating peanut butter before bed can support muscle growth, improve sleep quality, and stabilize blood sugar levels. Peanut butter also contains many micronutrients and remains a great source of vitamin E.u003cbr/u003eu003cbr/u003eAs peanut butter contains the amino acid tryptophan, it can help regulate an individual’s sleep-wake cycle and improve sleep quality by helping the body create melatonin and serotonin.