Sleep hygiene is treated like a boring checklist, but the five points that truly count are concrete, evidence-based, and worth doing properly rather than half-heartedly. Here they are, with the mechanism behind them and their place in a real routine.
1. Anchor your morning with real light
The circadian clock is primarily set by light, and morning light in the first hour after waking is its strongest signal. It anchors melatonin release about fourteen to sixteen hours later. Ten to thirty minutes outside do more for falling asleep at night than anything that happens in the evening itself. This is also the window for NMN, dissolved in water first thing in the morning, aligned with the body’s own NAD+ production cycle, which peaks in the morning and declines throughout the day. All major human NMN studies have dosed at this time for exactly this reason.
2. Keep the room cold, not cozy
The core body temperature must drop by one to two degrees to initiate deep sleep, and research consistently finds the deepest, most continuous sleep in rooms between 15 and 19 degrees Celsius—cooler than most people find comfortable while awake. This is one of the simplest and most overlooked levers, precisely because comfort and sleep physiology point in different directions here.
3. Cut the caffeine earlier than you think
The half-life of caffeine of five to six hours means that a coffee at 2 p.m. is still measurably active in the blood at bedtime, blocking the same adenosine receptors through which the day's sleep pressure builds up. A cutoff point eight to ten hours before bedtime is the number that research actually supports, not the vague "nothing in the evening" that most advice ends up at.
4. Dim the lights and put away screens an hour earlier
Blue light in the hour before sleep delays melatonin release by more than an hour in direct measurements. This hour is also the time for the second half of the LongevityLife. routine: applying the nasal strip before turning out the lights, so the airways are prepared for the night while the rest of the evening routine already winds down light and stimulation.
5. Support the airways, not just the environment
This is the lever that most sleep hygiene lists completely omit. Restricted nasal airflow during sleep, even a mild restriction that never produces loud snoring, lowers nighttime oxygen levels and triggers brief, unremembered arousal responses that fragment deep sleep and REM. The nasal strip addresses exactly this: it keeps the nasal passage open so that air flows as it should. That is why this step is built into the routine as a nightly fixture and not as an optional extra.
Why these five work as a system
Each lever targets a different mechanism—circadian timing, temperature, adenosine clearance, melatonin release, and breathing mechanics—and that is exactly why they reinforce each other instead of duplicating efforts. The LongevityLife. routine is built around exactly this logic: NMN in the morning to support the cellular energy system in its natural rhythm, and the nasal strip at night to support the one variable that almost all sleep advice omits: breathing. Five mechanisms, addressed at the right time of day, are a more complete approach than any single habit performed perfectly.