3. Coffee
Coffee disrupts our sleep-wake cycle, making it the worst evening beverage. Caffeine stimulates the brain by inhibiting adenosine receptors. Adenosine causes tiredness when these receptors aren’t inhibited.
Coffee boosts daytime alertness and productivity. We can’t sleep if we drink more than four cups a day, ideally before midday.
“Consuming caffeine six hours before night lowered total sleep time by one hour,” one study revealed. We wake up exhausted the next day and drink more coffee, repeating the cycle.
Summary: Coffee is a healthy stimulant with caffeine. If we drink too much late in the day, our brains will stay “turned on” to daytime mode, disrupting our sleep.
