Just when you thought you had sleep figured out, your 18-month-old starts waking at 2am like a tiny alarm clock that nobody programmed. Welcome to the 18-month sleep regression. The 18-month sleep regression is real, it is temporary, and it is driven by a developmental explosion happening inside your toddler brain. At 18 months, toddlers are experiencing massive leaps in language, independence, and cognitive awareness all at once. Sleep regression typically involves more frequent night waking, difficulty falling asleep at bedtime, earlier morning waking, and fighting naps. The most important thing is to maintain your bedtime routine with military consistency. Now is not the time to introduce new habits you will regret later like lying down with them until they fall asleep. When they wake at night, go in briefly to reassure them and then leave. Keep it boring and keep it brief. Daytime is a good time to talk about sleep in positive terms: bedtime helps you grow strong. Most 18-month sleep regressions resolve within 2 to 6 weeks if you hold firm to your routine. It does end. You will sleep again.