For most babies, falling asleep takes about 15 to 20 minutes once they’re put down. That’s the average sleep onset time researchers have found in studies tracking infants from 3 to 12 months of age, and it stays remarkably consistent through the toddler years. But “average” hides a wide range. Many parents spend 30 minutes to well over an hour on the process, especially when factoring in the full bedtime routine of feeding, changing, and soothing before a baby actually drifts off.
What “Normal” Looks Like by Age
Newborns are unpredictable sleepers. They spend about 16 hours a day sleeping, but roughly half of that is light, active sleep (the infant version of REM sleep). Newborns enter this light sleep phase first, which means they’re easily startled awake just minutes after you think they’ve fallen asleep. That frustrating cycle of dozing off and waking back up isn’t a problem to solve. It’s how newborn brains are wired.
By around 3 months, sleep patterns start organizing. Babies begin cycling through four stages of progressively deeper sleep before looping back through lighter stages. The transition from drowsiness (stage 1) to light sleep (stage 2) to deep sleep (stages 3 and 4) becomes more predictable, and the average time from being placed in the crib to being fully asleep settles around 15 to 20 minutes. This remains fairly stable through the first year and beyond. One longitudinal study found sleep onset latency averaged 19 minutes for children aged 0 to 2, with very little variation month to month after the newborn phase.
That said, a significant number of babies fall outside this average. In one study of infants and toddlers, about 58% took between 30 and 60 minutes to fall asleep, and roughly 28% took longer than an hour. If your baby regularly takes 45 minutes, you’re not doing anything wrong. You’re just on the longer end of a wide bell curve.
Why Some Babies Take Longer
The single biggest factor that extends sleep onset time is being overtired. It sounds counterintuitive, but a baby who has been awake too long actually has a harder time falling asleep, not an easier one. The reason is hormonal. When a baby misses their sleep window, the body’s stress response kicks in and starts producing cortisol and adrenaline. These hormones promote alertness and arousal. Instead of a drowsy baby who drifts off easily, you get a wired, fussy baby who fights sleep. Sleep deprivation has been shown to elevate resting cortisol levels and amplify the stress response, creating a cycle where being overtired makes it harder to sleep, which makes the baby even more overtired.
Watch for your baby’s early sleepy cues: staring off, rubbing eyes, yawning, turning away from stimulation. Catching that window before it closes can be the difference between a 15-minute settle and a 45-minute battle.
Temperament and Development
Some babies are simply more alert and stimulation-sensitive than others. Babies going through developmental leaps, like learning to roll over or crawl, often have temporary sleep regressions where falling asleep takes noticeably longer. Teething, illness, and growth spurts can all add time. These phases pass, usually within a week or two.
How Bedtime Routines Change the Timeline
A consistent bedtime routine is the most evidence-backed way to reduce the time it takes your baby to fall asleep. Research has found that a regular routine is associated with shorter sleep onset times, fewer night wakings, earlier bedtimes, and longer overall sleep duration. The relationship is dose-dependent, meaning the more consistently you follow the routine, night after night, the stronger the effect becomes. Parents who maintained a nightly routine also reported fewer sleep problems and fewer daytime behavior issues in their children.
The routine itself doesn’t need to be elaborate. A predictable sequence of 3 to 4 steps, like a bath, pajamas, a feeding, and a song or book, works well. What matters is consistency. The repetition signals to your baby’s brain that sleep is coming, which helps the body start winding down before you even place them in the crib. Most effective routines take 20 to 30 minutes from start to finish.
Independent Settling vs. Assisted Settling
How your baby falls asleep also affects how long the process takes. Babies who are placed in their crib drowsy but awake and given the chance to settle on their own tend to fall asleep faster over time compared to babies who are rocked, fed, or held to sleep every night. When you gradually reduce settling help, babies typically learn to fall asleep sooner on their own.
This doesn’t mean you need to leave a crying newborn alone. For babies under 4 months, responding to their needs and helping them fall asleep is completely appropriate. But starting around 4 to 6 months, most babies are developmentally capable of learning some self-settling skills. If you’re currently spending 40 minutes bouncing or rocking your 8-month-old to sleep each night, gradually scaling back that assistance will likely shorten the total time, even if the first few nights are rough.
Setting Up the Room for Faster Sleep
Environmental factors have a measurable impact on how quickly babies settle. Room temperature is one of the most important. Research suggests keeping the nursery between 68 and 72 degrees Fahrenheit (20 to 22 degrees Celsius). Anything above 72°F tends to be too warm and can make a baby restless. Overheating is also a known risk factor for sleep safety concerns, so erring on the cooler side is worthwhile.
Darkness matters more than most parents realize. Even small amounts of light can suppress melatonin production and signal wakefulness. Blackout curtains or shades help, especially during summer months or for early bedtimes when the sun is still up. White noise can also speed up settling by masking household sounds that trigger the startle reflex, particularly in the light sleep stages that babies cycle through at the beginning of the night.
When the Timing Is a Concern
If your baby consistently takes more than an hour to fall asleep despite a calm routine, appropriate wake windows, and a good sleep environment, it’s worth mentioning to your pediatrician. Chronic difficulty falling asleep can occasionally point to discomfort from reflux, food sensitivities, or breathing issues during sleep. Most of the time, though, long sleep onset is a behavioral pattern that responds well to adjustments in timing and routine rather than a medical problem.
The total picture matters more than any single night. A baby who takes 30 minutes to fall asleep but then sleeps well through the night is in a very different situation from one who takes an hour to fall asleep and wakes every 90 minutes. Track patterns over a week or two rather than fixating on one difficult evening.