A Healthy Child Needs a Healthy Brain, A Healthy Brain Needs Healthy Sleep

Two of the most useful concepts in infant sleep also generate more confusion and pushback than almost anything else. That confusion is worth addressing directly — because in most cases, the concept is not wrong. Something else is.

“Drowsy But Awake” — Why It Sometimes Seems Not to Work

For most parents, putting a baby down drowsy but still awake is the single most effective tool for teaching self-soothing. For others, it seems to produce nothing but frustration. Here is why.

The most common reason “drowsy but awake” appears to fail is mistiming. Many parents have learned to watch for signs that their baby is tired — fussiness, eye rubbing, yawning, pulling at ears. These are real signals, but they are late ones. By the time fussiness and eye rubbing arrive, the baby has already moved past drowsy and into overtired. Stress hormones are already present. The nervous system is already in a state of heightened arousal. Putting a baby down in this state — which feels like the right moment because the baby is clearly tired — is actually the wrong moment, and the struggle that follows feels like evidence that the approach does not work.

It is not the approach that is failing. It is the timing.

Early drowsy signs are subtler: a quieting of activity, slower movements, less social engagement, a slight glaze to the eyes. These appear before fussiness, not alongside it. Catching these early signs — and beginning the soothing routine at that moment — is the key. It requires practice and close attention, and it is harder to do when a parent is distracted by a phone, managing an older sibling, or in the middle of something else.

Clock-based nap apps and rigid interval timing make this worse, not better. They direct attention away from the baby and toward a schedule, and schedules cannot capture the individual variation in when any particular baby becomes drowsy on any particular day.

Another common obstacle: a baby who is never alone and quiet in the late afternoon has fewer opportunities to show drowsy signs at all. Constant interaction with parents, siblings, or screens masks the quieting that signals early drowsiness. A few minutes of calm, low-stimulation time in the late afternoon makes drowsy signs easier to see.

“Drowsy but awake” works reliably for about eighty percent of very young infants. The remaining twenty percent are colicky babies — those with more than three hours of fussing or crying per day, more than three days a week, for more than three weeks. For these babies, settling independently is genuinely harder, and intensive soothing to a deep sleep state is often what is needed just to survive the early months. “Drowsy but awake” should be set aside until the colic resolves, which happens in half of affected babies by two months and in nearly all by three to four months.

After colic ends, some babies continue to seem difficult to settle. Some parents, reasonably, attribute this to their baby’s temperament — interpreting their child as a sensitive “signaler” rather than an “easy-going soother” — and conclude that their baby is simply not suited to independent settling. Sometimes this is accurate. More often, what is actually happening is that the wake intervals are still too long, the bedtime is still too late, or the drowsy window is still being missed consistently. With healthy sleep over time, many post-colic infants develop easier temperaments. Blaming the baby’s temperament for a timing problem delays the solution and adds unnecessary guilt.

One more common failure point: after six weeks of age, if the bedtime has not moved earlier to match the brain’s developing circadian preference, cumulative sleep debt builds quietly. A baby carrying that debt is harder to settle regardless of how carefully the drowsy window is caught. “Drowsy but awake” is less likely to succeed when the foundation of an appropriate early bedtime is not in place.

Two Opposite Objections

Some parents reject “drowsy but awake” from one direction: they want to put their baby down fully awake, believing this produces more truly independent sleep. The evidence does not support this. Calming bedtime routines — feeding, rocking, singing, gentle holding — actively help babies transition into sleep and are directly associated with drowsiness at bedtime. The soothing is part of the process, not a crutch.

Other parents reject it from the opposite direction: they believe independent settling is unnatural or developmentally inappropriate. They are correct that babies fall asleep differently in different cultures and family contexts. In the setting of proactive co-sleeping combined with unrestricted breastfeeding and continuous carrying, some families navigate infancy without sleep problems. But in Western contexts where this level of around-the-clock contact is usually not sustained, babies who have not learned to self-soothe commonly develop a pattern of frequent middle-of-the-night wakings that require parental soothing to resolve.

“Sleep Begets Sleep” — Why It Sometimes Seems False

Some parents observe that their baby takes long naps but still struggles to fall asleep at night or wakes frequently. From this they conclude that “sleep begets sleep” must be wrong — that too much daytime sleep is actually reducing the drive for nighttime sleep.

This conclusion has the causal direction backwards.

What is almost always actually happening is this: the bedtime is too late, producing pre-sleep arousal and fragmented or abbreviated night sleep. The baby wakes in the morning already depleted. To partially compensate, the baby sleeps more during the day, when parents provide nap opportunities. The long naps are a consequence of insufficient night sleep — not a cause of it.

Parents who reach the wrong conclusion focus on the long nap duration and overlook what is happening at night, particularly the bedtime. The fix is not to shorten the naps. It is to move the bedtime earlier, reduce the pre-sleep arousal, improve the night sleep — and watch the daytime sleep naturally find its own appropriate level.

“Sleep begets sleep” is not a myth. A well-rested baby falls asleep more easily, sleeps more deeply, and wakes less often. The virtuous circle is real. So is the vicious one that runs in the other direction: a baby who is not sleeping well at night compensates during the day, appears to be napping “too much,” and gives exhausted parents the impression that daytime sleep is the problem when it is actually the symptom.

The bedtime is almost always where to look first.

— Marc Weissbluth, M.D.