These are the tip of a huge iceberg. There are hundreds of studies of sleep training. These are just a few from a quick search, as I really should be doing an interview right now.
"Behavior Characteristics and Security in Sleep-Disturbed Infants
Treated with Extinction"
Karyn G. France
University of Canterbury
Journal of Pediatric Psychology 17(4) pp. 467-475, 1992
study here
"Measured and compared the behavior characteristics and security
scores of 35 infants (6?24 months) treated with extinction for sleep
disturbance with those of 13 untreated and 15 normal sleep controls.
There was no evidence of detrimental effects on the treated infants
whose security, emotionality/tension, and likeability scores improved.
The findings are congruent with those from a previous study with
preschoolers and have important implications for the prevention of
later behavior problems in sleep-disturbed children."
This study found that babies (and parents) were happier and healthier
after an ignoring treatment, and the babies cried much less than their
rocked-to-sleep counterparts.
"Treatment of Young Children's Bedtime Refusal and Nighttime Wakings:
A Comparison of ?Standard? and Graduated Ignoring Procedures"
Journal of Abnormal Child Psychology
study here
"Following treatment, only positive side effects were observed. When
compared to the wait-list group, mothers in the standard ignoring
group reported less verbose discipline and decreased stress in
parenting, while mothers in the graduated ignoring group reported
improved parent?child relationships. Treatment gains were maintained
over a 2-month follow-up period."
"Reducing Nocturnal Awakening and Crying Episodes in Infants and Young
Children: A Comparison Between Scheduled Awakenings and Systematic
Ignoring"
PEDIATRICS Vol. 81 No. 2 February 1988, pp. 203-212
Vaughn I. Rickert PsyD and C. Merle Johnson PhD1
study here
full text
According to this study, the well-being of families (both parents and
children) improves after using the extinction method.
"Treatment of sleep problems in families with young children: effects
of treatment on family well-being."
- Eckerberg B.
Department of Paediatrics, Falun Hospital, Falun, Sweden.
[email protected]
study here
"CONCLUSION: If parents experience young children's night awakenings
as a problem, teaching the children to fall asleep by themselves
usually solves this problem quickly. According to parental ratings,
family well-being and negative daytime behaviour are also improved."
--
This article recommends early intervention in sleep problems and that
children whose sleep problems are not dealt with will most likely
continue to have sleep problems in ongoing years.
Journal of Pediatrics
1987 Apr;110(4):642-6.
- Kataria S,
- Swanson MS,
- Trevathan GE.
study here