03/26/2026
Does the Ferber Method (also called Graduated Extinction or “controlled crying”) actually reduce night wakings or improve infant sleep?
A randomized controlled trial by Hall et al. (2015) explored this question in infants aged 6–8 months.
Families were randomly assigned to either a sleep intervention group, which included guidance on Graduated Extinction and education about normal infant sleep and bedtime routines, or a control group, which received general safety education but no sleep-specific support.
Sleep was measured in two ways: objectively, using actigraphy to track night waking and total sleep, and subjectively, using parent diaries and questionnaires. This distinction is important because what babies actually do and how sleep feels for parents can be very different.
Parents in the intervention group reported differences in their perception of overall sleep quality, as well as changes in their own stress, mood, and fatigue associated with sleep.
Objectively, however, there was no significant difference between groups: about 97% of infants in both groups woke two or more times per night, and total sleep remained the same. The measured difference between groups was only −0.2%, which was not statistically significant.
The main takeaway is simple but important. Infant sleep itself did not change, but parent perception did. Both of these can be true at the same time. Understanding the evidence empowers parents to make informed, intentional choices about their family’s sleep.
Do study summaries like this help you make sense of sleep? What other sleep topics would you like to see backed by research?
Hall, W. A., Hutton, E., Brant, R. F., Collet, J. P., Gregg, K., Saunders, R., et al. (2015). A randomized controlled trial of an intervention for infants’ behavioral sleep problems. BMC Pediatrics, 15, 181. https://doi.org/10.1186/s12887-015-0492-7