If you have twins and one sleeps longer, easier, or more predictably than the other, you’re probably asking yourself the same question most twin parents do:
Is something wrong?
Am I doing something differently?
Shouldn’t twins sleep the same?
The short answer: yes, it’s completely normal for one twin to sleep worse than the other — especially in the first months. And no, it doesn’t mean you’re failing or missing something obvious.
Let’s talk about why this happens and when (if ever) you should worry.
Yes — It’s Normal (Even Though It Feels Unfair)
Twins may share a womb, but they are still two separate humans. Different nervous systems, different sensitivities, different sleep needs.
One twin might:
- Fall asleep easily
- Stay asleep longer
- Wake calmly
While the other:
- Wakes more often
- Needs more help settling
- Is more sensitive to noise, light, or hunger
This difference can show up from the very beginning, and it often has nothing to do with how you’re feeding or soothing them.
Understanding night wakings can help — see Twin Night Wakings.
Common Reasons One Twin Sleeps Worse
Temperament matters more than routines
Some babies are naturally more alert or sensitive. That doesn’t mean they’re “bad sleepers” — just wired differently.
Feeding differences
One twin may:
- Eat more efficiently
- Digest faster
- Need fewer night feeds
Even small differences in intake can affect sleep patterns.
Birth differences
If one twin:
- Was smaller
- Spent time in the NICU
- Had reflux or gas
Their sleep may be more disrupted early on.
Developmental timing
Babies don’t hit sleep milestones at the same moment — even twins. One may mature neurologically faster than the other.
Why Comparing Twins Makes Sleep Feel Harder
Twin parenting comes with built-in comparison, and sleep is the easiest place to spiral.
When one twin sleeps well, every wake-up from the other feels louder, longer, and more frustrating. It can make you question everything you’re doing — even when nothing is wrong.
This is where many parents burn out emotionally, not physically.
Should You Try to “Fix” the Worse Sleeper?
Most of the time: no — at least not aggressively.
Instead of trying to force both twins into identical sleep patterns, focus on:
- Consistent routines (not rigid schedules)
- Responding to each baby’s needs individually
- Supporting sleep gently rather than controlling it
Trying to “train” a newborn twin out of normal wake-ups often creates more stress than results.
When Differences Can Be a Red Flag
While sleep differences are normal, check in with your pediatrician if one twin:
- Seems constantly uncomfortable or in pain
- Is not gaining weight well
- Rarely settles even with feeding and comfort
- Has dramatically different energy or responsiveness
Trust your instincts — but don’t assume difference equals danger.
For a full overview of sleep in the first 6 months, check Twin Sleep in the First 6 Months.
What Helped Me Cope (More Than Any Sleep Tip)
What helped most wasn’t finding the perfect sleep solution — it was accepting that my twins didn’t need to sleep the same to be okay.
Once I stopped trying to make nights “even,” they became more manageable.
Some nights were still hard. But they stopped feeling like a personal failure.
You’re Not Doing Anything Wrong
If one twin sleeps worse than the other, it doesn’t mean:
- You’re missing a trick
- You created bad habits
- One baby is broken
It means you’re parenting two different babies at the same time — which is already a lot.
If you want a calm, realistic approach to sleep, feeding, and survival in those early weeks, you can download my free Twin Newborn Survival Guide. It’s built for real life, not perfection.
