Sleep Is Not Something You Do. It Is Something That Happens to You.

On the Aging Backward Growing Forward podcast with Eric Casaburi, Dr. Meeta Singh walked through what actually happens across a night. Most people treat sleep as a task to be performed well. Her correction is the most useful sentence in the conversation: sleep is not something we do, it is something that happens to us.

Aging Backward Growing Forward, October 2023.

Your job is to create the conditions. The brain handles the rest, and it does not need supervision.

What a night actually looks like

Sleep is a behavior found in everything from single-celled organisms upward, a state in which information stops flowing in and out of the brain. Because the body is forced into inactivity, rest and recovery happen. From the outside you look switched off. Inside, the brain is busy.

Broadly, sleep divides into three kinds:

• Light sleep (stages N1 and N2), the entry to sleep and a genuine part of it.
• Deep sleep, when breathing, blood pressure and pulse are at their lowest. This is when muscle recovery happens and growth hormone is secreted. Restoration happens here.
• REM or dream sleep, whose function is to attach emotional context to memory. Whatever happened during the day gets made sense of here.

A full cycle runs roughly 90 to 110 minutes, and you move through several across a night. Most deep sleep is concentrated in the earlier part.

Which leads to a question people ask constantly, about how to get more deep sleep specifically. Dr. Singh's answer is that there is no good way to increase one stage in isolation. If one stage goes up, another has generally gone down. Devices may claim otherwise. What actually works is giving yourself enough time in bed, in a calm dark room, having wound down, and then letting the brain cycle through what it needs.

Waking in the night is usually normal

Going to bed at eleven and waking around four is often just the sleep drive having been largely consumed, making you more aware of a natural awakening. Sometimes the cause is more ordinary still: needing the bathroom, pain, or a noisy room, in which case the cause is what deserves attention.

But in most cases the problem is not the waking. It is what happens next.

The phone is by the bed. You reach for it, check the time, and start calculating: I went to bed at this hour, it has been this long, this is how tomorrow is going to feel. That calculation alone is a signal to the brain to become alert. Then people do not stop at the clock. They open social media, or decide to answer one email, or wake with an idea that feels urgent enough to text the team about.

Commanding yourself to fall asleep is the worst available move. Watching the clock and insisting is mentally arousing, which produces exactly the opposite of what you want.

The landing approach

Dr. Singh's analogy for winding down is an aircraft. A plane does not simply drop onto the runway. It loses altitude, slows, and then lands. Sleep works the same way, and most people try to flop.

Thirty to forty-five minutes before bed, set an alarm if you need one, and do something that lowers altitude: a hot bath or shower, stretching, breathing exercises, a relaxing podcast, meditation or a spiritual practice. Sexual activity is genuinely relaxing and helps too.

The same activities work in the middle of the night, assuming no underlying disorder is causing the waking. The crucial part is that they are not aimed at falling asleep. They are aimed at relaxing, and sleep follows.

Breathing patterns like four-seven-eight work on this principle. Dr. Singh is straightforward that she does not think the specific numbers rest on hard science. What the technique does is occupy your attention with counting instead of the thoughts keeping you awake, while calming the body. It works while awake during the day for the same reason.

Sleep hygiene, precisely

Sleep hygiene is a specific scientific term covering everything around your sleep, not a synonym for discipline.

Environment. Cool, dark and quiet is the general rule, and it should be individualized. Some people sleep better with a low nightlight rather than total darkness. Some do better with the constant hum of a sound machine. A comfortable bed and a cool room are the reliable parts.

What you take in. Caffeine too close to bedtime interrupts sleep. Nicotine feels relaxing and is a stimulant, which can prevent deeper stages. Alcohol helps people fall asleep and then fractures sleep as the night progresses, disrupting it without the drinker being aware.

Temperature-controlling mattresses and similar products are, in her assessment, an effective tool for a specific problem: a person who struggles to regulate temperature at night, particularly when sharing a bed with someone who prefers a different one.

On rings, straps and HRV

Heart rate variability shows up on most wearables now, and it is a reasonable proxy for how relaxed the body was. Higher variability generally indicates a healthier, more relaxed state, driven by the parasympathetic side of the autonomic nervous system, the rest side rather than the fight-or-flight side. A higher HRV suggests restful sleep, a lower one suggests you were less relaxed.

Dr. Singh's framing of all of it is consistent: these are tools. A ring or a mattress might help you optimize. They do not do the work. Because sleep is a behavior, a person's emotional health and how well-adjusted their life is will shape their night regardless of what is on their finger.

Before you reach for a supplement

Melatonin is a hormone the brain secretes naturally in darkness, signaling readiness for sleep. In the United States it is available over the counter, and it is widely used for exactly the situation where evidence does not support it: the American Academy of Sleep Medicine's position is that melatonin is not effective for chronic insomnia, meaning difficulty initiating or maintaining sleep lasting three months or more. That is precisely how most people use it.

Her message is to ask the prior question. Why are you having difficulty sleeping? If someone is not sleeping because of significant pain, melatonin will not address the pain. If someone has sleep apnea, that is what needs treating. If you are reaching for a supplement regularly, that is a conversation to have with your primary care provider rather than a purchase to repeat.

The honest limit

This is general information, not a diagnosis or a treatment plan for any individual. Persistent difficulty sleeping, loud snoring or pauses in breathing, or daytime impairment despite adequate time in bed, should be evaluated by a clinician. No routine described here substitutes for that.

Source

• "The Science of Sleep: A Conversation with Dr. Meeta Singh," Aging Backward Growing Forward with Eric Casaburi, October 20, 2023. Watch