Healthy Sleep Habits, Happy Child
Temperament-Sleep (2 of 3)
October 4, 2021

Found in age groups

Healthy Sleep Habits, Happy Child

5th Edition: 
A Step-by-Step Program for a Good Night's Sleep

Buy now

Healthy Sleep Habits, Happy Child

5th Edition: 
Chapter 1 (only 16 pages!) outlines everything you need to know about your child's sleep.

Buy now


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

If you have not already done so, please read Blog Posts 1 through 5 that describe how sleep is important and beneficial. I will post specific information for parents and children based on my book, “Healthy Sleep Habits, Happy Child.” Please do not be put off by my book’s length. This is a reference book. Read only the topic of interest to you.

Blog 47Temperament-Sleep (2 of 3)


I discovered an association between temperament characteristics and sleep. In my study of sixty 4- to 5-month-old infants, the infants rated as having a difficult temperament had average sleep times substantially less than the infants rated as easy (12.3 versus 15.6 hours). Also, four of the individual temperament traits (mood, adaptability, rhythmicity, and approach/withdrawal) were each highly associated with total sleep duration. When this study was extended to include 105 infants, those infants with difficult temperaments slept 12.8 hours and those with easy temperaments slept 14.9 hours. This observation was subsequently confirmed in a study of Chinese-American infants of similar age but with different parenting practices.

It thus appears that infants who have a difficult temperament have briefer total sleep durations when assessed at 4–5 months of age regardless of differences in parenting practices. In addition to short sleep durations, a study of children between 6 and 36 months showed that more fragmented sleep is associated with a more difficult temperament. Also, a Canadian study showed that sleep difficulties starting around 5 months persist at age 6 years and that “sleep difficulties likely are part of the difficult temperament profile.” A Swedish study of children, over the same age range, also noted stability over time of frequent night wakings and low quality of sleep. 

Perhaps the temperament-sleep association at 4–5 months is caused by biological features. For example, a continuation of sleep issues in a post-colic infant (who no longer is prone to spells of fussing or crying). Alternatively, the association between temperament and sleep may reflect parent issues such as maternal anxiety resulting in the inability to establish healthy sleep habits. Or both (Blog Posts 3945). 

In support of a biological or baby-driven path, a study of about one thousand Canadian families, temperament assessments were performed at age 5 and 17 months. “Maladaptive parental behaviors” were recorded at 29 and 41 months and included mother’s presence until the child fell asleep, giving food/drink after child wakes in the night, and co-sleeping in the mother’s bed after awakening at night. Analysis of the data “support the suggestion that difficult temperament is the original context within which sleep disturbances arise . . . when controlling for early sleep problems, difficult temperament remained predictive only of shorter total sleep time [at age 6 years].” Their findings further “suggest that sleep difficulties likely are part of the difficult temperament . . . [and maladaptive parental behaviors] develop in reaction to prior sleep problems [emphasis added].”

Support for a persistent parent-driven path between temperament and sleep is based on a study by Dr. Marcia Keener in which objective measures of sleep/wake organization, derived from time-lapse video recordings, were compared with parental perceptions of infant temperament at 6 months of age. Dr. Keener stated that “infants considered [temperamentally] easy have longer sleep periods and spend less time out of the crib for caretaking interventions during the night.” Her analysis also led her to the conclusion that night waking is caused by parental rather than biological factors. This observation of increased time out of the crib for temperamentally more difficult children at 6 months is similar to the observation that increased night waking occurs in formerly colicky infants at 4, 8, and 12 months, and it is also similar to the observation that mothers with depressive symptoms unnecessarily attend to their babies by removing them from the crib more often than mothers without these symptoms (Blog Post 45).

The framing of the question as to whether biological factors in the baby (such as colic or difficult temperament) or parenting issues (such as maternal anxiety or depression) cause persisting sleep problems may be fundamentally incorrect. Genetic influences regarding temperament, sleep duration (Blog Post 14), and screen time (Blog Post 22) may play a role contributing both to baby and parent behavior. In fact, a careful analysis of forty-five longitudinal studies of sleep behavior in children 4–12 years found only 12 studies that were rated as “high quality.” Examining these 12 studies, the researchers looked at 61 possible determinants for sleep duration. Only 3 determinants showed evidence for causing short sleep duration: A past history of short sleep duration, a difficult temperament and more screen time

But genetics is not destiny. I believe that sleep modulates temperament (Blog Post 48), so it is important to get a handle on your child’s sleep early to influence temperament and thus mitigate adverse sleep outcomes associated with a difficult temperament.

(To be continued.)


  1. I find this so interesting, studying temperament myself in regards to behavior and thus parental reactions and practices, I was wondering if you think that if we help parents understand temperament characteristics, would this help them adapt best parenting practices in facilitating healthy sleep practices?

  2. Many parents refer to their child as “highly sensitive”. Do you feel these children fall into the difficult temperament category?

    1. Threshold (sensitivity) is not part of the part of the diagnostic cluster of ‘difficult’ or ‘easy’ temperament group. Also, at 4 months and at 3 years, ‘threshold’ was not related to sleep duration.

  3. What sleep training methods are best for a difficult baby? (Less than 6 months with multiple night wakings, difficult to put back to sleep)

Add comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Related blogs

These blogs are related or mentioned in this blog.
Blog 14
  | February 15, 2021
 | No Comments

Be Flexible

Parents would like to have a plan that guarantees healthy sleep for their child, like a tested recipe guarantees a sweet cupcake. Unfortunately, there is not one plan that fits all families. The principles discussed in Blog Posts 1 through 13 have to be adapted to specific individual, cultural, and family circumstances, or what the Army calls “mission constraints.”
Read full post
Blog 22
  | April 12, 2021
 | No Comments

No TV in Bedroom

Dr Jenny Radesky’s research suggests that having a television or other media in the child’s bedroom may be a parental response to their child’s not sleeping well; that is, allowing more screen time is a coping strategy.
Read full post
Blog 39
  | August 9, 2021
 | No Comments

Parental Anxiety, Depression, and Cognitive Biases (1 of 4)

When children are not sleeping well, the cause might be the father, the mother, the baby or any combination. Even if the root cause or trigger might occur within the father, or the mother, or the baby, as time passes, interactive effects develop between all three.
Read full post
Blog 45
  | September 20, 2021
 | No Comments

Big Picture: Maternal Anxiety and Infant Sleep Patterns

A woman with anxiety symptoms (or dysfunctional cognitions regarding attending to her baby at night) becomes pregnant. She might worry about the pregnancy, her baby, becoming a mother, the father or any other aspect of her life.
Read full post
Blog 48
  | October 11, 2021
 | No Comments

Sleep Modulates Temperament (3 of 3)

The exact same 60 infants that I examined at 4 months of age were restudied at 3 years. Again, at age 3 years, temperamentally easy children had longer total sleep durations compared with children with more difficult temperaments.
Read full post

Stay updated with new blog posts

Get access to free lullabies when signing up!
Get notified when new blogs are posted
Notify me
About Marc
The first month
The second month
Months 3-4
Months 4-12
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram