My Toddler Was Sleeping Well and Now Is Not – What Is Happening?
Toddler sleep regressions at 18 months and 2 years explained, with practical strategies and the difference between night terrors and nightmares.
Why Sleep Regression Happens at 18 Months and 2 Years
Toddler sleep regressions are real and common. Unlike the newborn stage where regressions are mostly physical (hunger, growth), toddler regressions are largely driven by neurological and developmental changes happening at a rapid pace.
| Age | What's Happening Developmentally | Sleep Impact |
|---|---|---|
| 18 months | Language explosion, increased independence drive, separation anxiety peaks, molar teething begins | Bedtime resistance, night waking, difficulty settling at nap |
| 2 years | Imagination activates (nightmares begin), awareness of the world expands, growing autonomy | Night fears, refusing to go to sleep alone, calling out at night |
Toddler regressions feel worse than newborn regressions because you had a period of good sleep and have now lost it, but they differ in that toddlers can be reasoned with (partially) and given tools to self-regulate. This makes them more manageable with the right approach.
Common Triggers Beyond Developmental Leaps
Developmental stages explain many regressions, but specific life events can also trigger sleep disruption in toddlers who were previously sleeping well.
- Starting preschool or childcare (the combination of new environment, effort to hold it together all day, and release at home)
- New sibling arriving
- Change of caregiver or helper change
- Moving to a new home or significant change to the bedroom environment
- Travel across time zones or disrupted holiday routines
- Illness and recovery (fever, hand-foot-mouth disease, which is common in Singapore childcare centres)
- Molar teething (18 months and again at age 2 to 3 for second molars)
Strategies That Help
Keep the routine consistent. Toddlers thrive on predictability. Bath, milk, stories, lights out at the same time each night provides a landing sequence that signals sleep is coming.
Try an earlier bedtime. Counterintuitively, an overtired toddler sleeps worse, not better. Moving bedtime 20 to 30 minutes earlier during a regression often reduces night waking.
Offer extra reassurance without creating new habits. Staying in the room briefly is fine. Moving the child to your bed every night creates a harder-to-break pattern. A "monster spray" (water in a spray bottle) or nightlight can reduce fear-based waking.
Give more connection during the day. Sometimes night waking is partly driven by a need for more connection with parents. Extra floor time, reading together, and physical affection during the day can reduce the nighttime drive.
Regressions typically last 2 to 6 weeks if you maintain consistent boundaries. If you inadvertently create new sleep associations during the regression (e.g. moving child to your bed every night), the regression pattern may persist beyond the developmental cause.
Night Terrors vs Nightmares: What Is the Difference?
Night Terrors
- Occur in the first half of the night (1 to 3 hours after falling asleep)
- Child appears awake but is not (screaming, eyes open, confused)
- Child cannot be comforted and does not recognise you
- Child has no memory of the episode in the morning
- Do not wake the child; stay nearby and keep them safe
- Pass on their own in 5 to 20 minutes
Nightmares
- Occur in the second half of the night (during REM sleep)
- Child wakes up fully, recognises you, wants comfort
- Child may remember the dream and be able to describe it
- Can be comforted and will settle back to sleep
- Offer reassurance: "You're safe, I'm here"
- Common after age 2 when imagination develops
Medical disclaimer: this content is for general informational purposes only. Persistent severe sleep disruption or suspected sleep disorders should be discussed with a paediatrician or sleep specialist.