Sleep Regressions: What They Are and How to Survive Them
Sleep suddenly terrible when it was going well? You are probably in a regression. Here is what is happening and what to do.
Sleep regressions are some of the most reliably demoralising moments of the first two years. Just when you think you have cracked it, baby suddenly wakes up five times a night again and you find yourself searching for answers at 3am.
The good news: they are temporary, they are normal, and they usually mean something developmentally brilliant is happening.
What is a sleep regression?
A sleep regression is a period when a baby or toddler who was previously sleeping well suddenly starts waking more frequently, resisting sleep, or napping shorter stretches. They are linked to developmental leaps, growth spurts, and neurological changes.
The 4-month regression
This is widely considered the most significant regression and unlike the others, it is actually a permanent change in how babies sleep. Before 4 months, babies cycle through just two sleep stages. After 4 months, they cycle through four stages like adults do, including a lighter stage where they are easier to rouse.
The 4-month regression is not something you wait out. It is a signal that baby's sleep architecture has matured to the point where sleep training, if you choose it, can begin.
The 8-10 month regression
This coincides with a huge developmental period. Babies are learning to crawl, pull to stand, and beginning to understand object permanence. Their brains are incredibly busy and this often disrupts sleep. Separation anxiety also peaks around this time.
The 12-month regression
A combination of walking milestones, the nap transition from two naps to one, and continued developmental acceleration can make this a tricky period.
The 18-month regression
Toddlerhood brings new challenges: language explosion, increased independence, molars coming in, and a natural testing of boundaries that extends to bedtime.
What helps
Consistency is the most important tool through any regression. Stick to your existing bedtime routine and schedule as closely as possible.
Offer extra connection during the day. Extra cuddles, face-to-face time, and predictable routines help babies feel secure enough to settle at night.
The average regression lasts 2 to 6 weeks. You will get through it.
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