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Black coffee can keep you awake for 4–6 hours, and sleep can still take a hit for up to 8–12 hours if you’re sensitive or drink it late.

Brewed tea tastes best within 4 hours on the counter; chill it within 8 hours, and toss any tea with milk after 2 hours.

Prepared green tea keeps about 3–4 days refrigerated; at room temp, drink it the same day or toss if it turns sour.

Black tea brews cleanly with 90–100°C (194–212°F) water, with hotter water for hearty blends and cooler water for delicate whole-leaf teas.

Coffee can raise blood pressure for about 1–3 hours, with the strongest rise in the first hour after a cup.

Coffee effects peak in 30–60 minutes and can last 4–6 hours, while sleep may be affected for 6–8 hours.

Caffeine from coffee peaks in breast milk 1–2 hours after you drink it, then drops over the next several hours.

Brew tea between 160–212°F (71–100°C); match the tea type so it tastes smooth, not bitter.

Tea tastes best when brewed at the right water temperature, then cooled to a sip range that feels hot but won’t burn.

Loose leaf tea tastes freshest for 6 to 12 months and stays fine to drink for 1 to 3 years when kept dry, sealed, and away from light.