Why your toddler stopped sleeping through the night
Mostly it's a developmental phase between 18 and 24 months. Three things usually help; the rest is patience and not panicking.
If your kid was sleeping ten straight hours and is now waking up twice a night standing in the crib chanting your name, you're probably in a regression. They're real. They're temporary. They have nothing to do with you having "ruined" anything.
Sleep regressions cluster around big developmental jumps. The 18-month one is the classic — language exploding, separation anxiety peaking, molars probably arriving uninvited. The 2-year regression is the same story with a different cast. Your toddler isn't broken. Their brain is upgrading and the firmware install takes a few weeks.
A few things tend to actually help. The first is boring: keep the schedule. Wake-up window, nap, bedtime — all of it within 15 minutes of where it usually lives. Toddlers regulate everything off the schedule and a "let's just try a later bedtime tonight" lights up the chaos.
The second is keeping the bedroom genuinely dark and pretty cold. A sleep-friendly room is darker and cooler than you'd think. Blackout curtains are not optional once your kid is in this phase, and a temperature around 68°F is closer to ideal than 72°F. If the only thing changing in your house is daylight savings, that may be your whole problem.
The third is sitting with the urge to fix it. When they wake up screaming, the instinct is to scoop them up, walk them, rock them, basically do whatever stops the screaming in the next 90 seconds. The problem is that whatever you do at 3am tonight is what they will need at 3am tomorrow. Most kids in this phase will resettle in 5-15 minutes if you give them a chance — even some loud crying minutes. This is not "cry it out"; it's "don't immediately become the new sleep crutch."
If wake-ups go past three weeks with no improvement, or your kid is fighting bedtime for over an hour, or there's any reason to suspect ear pain or reflux, call your pediatrician. Otherwise: ride it.
[ WHAT TO ACTUALLY DO ]
- Keep the schedule within a 15-minute window
- Make the room darker and cooler than you think it needs to be
- When they wake at night, wait 5–15 minutes before going in
- Don't introduce a new sleep crutch you'll have to undo later
- Call the pediatrician if it stretches past 3 weeks or you suspect pain
[ SOURCES ]
- Sleep Foundation — Toddler Sleep Regressions — overview of timing and developmental causes
- American Academy of Pediatrics — Healthy Sleep Habits — schedule and total-sleep guidance
- Nemours KidsHealth — Sleep and Toddlers — practical bedtime-routine framing