Sleep & Longevity

Bright light in the first hour after waking sets your circadian rhythm and anchors your body clock so melatonin rises at the right time. Get it outdoors if you can, since indoor or window light is often too dim to count.

Caffeine has a 5-6 hour half-life: a 2 PM coffee still has half its effect at 8 PM. It can also amplify anxiety, so cutting it after lunch calms both sleep and stress. Switch to herbal tea or decaf.

Your body needs to cool down a few degrees to fall asleep. A cool room helps that happen and is one of the simplest changes that meaningfully improves sleep.

Even small amounts of light suppress melatonin. Use blackout curtains or a quality sleep mask, and cover or remove LED indicators.

Your body clock depends on regularity. Sleeping in on weekends creates "social jet lag" that throws off your sleep all week.

Dim lights, put screens away, and do a calming routine (tea, stretching, reading). Your brain learns to recognize that bedtime is coming.

Late meals raise your body temperature and keep your stomach busy when it should be winding down. Aim for a 2-3 hour buffer between your last meal and bedtime.

Alcohol may help you fall asleep faster but fragments sleep cycles, reducing deep sleep and REM. Even 1-2 drinks close to bed measurably reduce quality.

If you work, watch TV, or eat in bed, your brain stops associating it with sleep. Reserve it exclusively, and you'll fall asleep faster when you lie down.

Don't check the time (this increases anxiety). Get up, do a calm dim activity until sleepy, then return. Lying awake trains your brain to associate bed with frustration.

A short, well-timed nap boosts alertness without disrupting nighttime sleep. Longer or later naps borrow from sleep quality.

If you've optimized your environment and routine but still sleep poorly, undiagnosed conditions (sleep apnea, thyroid, deficiencies) can be easily missed. Loud habitual snoring, witnessed breathing pauses, or waking unrefreshed are worth mentioning, since they can signal treatable sleep apnea. Professional testing is worth it before any supplement or medication.

Use a wearable or sleep app to monitor deep sleep and REM. Even with 7-8 hours in bed, broken sleep cycles reduce the benefit. Tracking surfaces hidden issues.

A 10-minute warm soak roughly an hour or two before bed warms your skin so your core temperature drops faster afterward, the body's trigger for sleep onset. Counterintuitively, warming up first helps you cool down into sleep. When a bath isn't practical, warm socks or a brief footbath work the same way.

Source: Haghayegh et al. 2019 — Sleep Medicine Reviews

Bright, blue-rich light in the hours before bed suppresses melatonin and pushes your body clock later, while warm, low lamps preserve your natural melatonin rise. Keep evening rooms dim and amber rather than bright and white. For any nighttime bathroom trip, a dim red or amber nightlight disturbs your clock far less than bright white light.

Source: Gooley et al. 2011 — J Clinical Endocrinology & Metabolism

Food is a powerful timing cue for the clocks in your liver and metabolic tissues, so keeping meals at consistent times helps keep your whole-body clock aligned with your sleep clock. In one trial, shifting meals 5 hours later shifted blood-glucose rhythms by nearly 6 hours.

Source: Wehrens et al. 2017 — Current Biology

A couple of hours before bed, write each nagging worry in one column and its next concrete step in a second column, then close the notebook. Offloading and problem-solving early lowers pre-sleep mental arousal so racing thoughts don't ambush you at lights-out.

Source: Carney & Waters 2006 — Behavioral Sleep Medicine