Why does one twin sleep so much better than the other?

Twins are two separate babies with their own temperaments, sleep drives and milestones. Different sleep from birth is normal and does not mean you are doing anything wrong with either of them.

Should I wake the good sleeper to match the other?

Not at night. The one time waking helps is a gentle nudge in the morning or from the last nap to keep their daytime timing lined up, which supports overlapping naps without disturbing good night sleep.

Is the waking twin hungry or just habit?

Both are common. A week of tracking usually shows it: hunger tends to settle with a feed and a longer stretch after, while habit wakings happen at similar clock times and settle without much. Ask your health visitor or doctor if you are unsure.

Will the gap ever close?

It usually narrows over weeks as the lighter sleeper matures and learns to link cycles. Growth spurts and the 4 month sleep change can widen it briefly before it settles again.

Should they share a room if one wakes so much?

Most twins can share and often sleep through each other's brief wakings. If the waking is disruptive, quick calm resettles and a steady background sound help more than separating them.

One twin sleeps, the other wakes

One twin sleeps through, the other is up all night

EmmaSep 18, 2026

Quick answer

If one twin sleeps through and the other wakes repeatedly, treat them as two babies with two patterns rather than one problem. Keep their daytime timing matched, rule out hunger or discomfort for the waker, and resettle with the least help that works so the lighter sleeper learns to link cycles. The gap usually narrows over a few weeks, and matching wake times keeps the good sleeper from drifting the other way.

One twin goes down at 7pm and you barely hear from them until morning. The other is up at 10, at midnight, at 2 and again at 4. You start to wonder what you did differently, and the answer is usually nothing.

Twins are two babies. From the first weeks they can have completely different sleep, and the gap between a natural sleeper and a lighter one is often widest in the early months.

Find out what the waker actually needs

Before you change anything, watch for a week. Is the waking twin hungry, uncomfortable, or waking out of habit at the same times each night? The fix is different for each, so it is worth knowing which one you are dealing with. If you are worried about feeding or weight, check with your health visitor or doctor.

Keep their days lined up

The lever you have is daytime timing. When both twins are on the same wake windows and nap slots, the settled twin's rhythm tends to pull the waker along. Resettle the waker quickly and quietly so the good sleeper stays asleep, and the gap usually starts to close.

Frequently asked questions

Why does one twin sleep so much better than the other?: Twins are two separate babies with their own temperaments, sleep drives and milestones. Different sleep from birth is normal and does not mean you are doing anything wrong with either of them.
Should I wake the good sleeper to match the other?: Not at night. The one time waking helps is a gentle nudge in the morning or from the last nap to keep their daytime timing lined up, which supports overlapping naps without disturbing good night sleep.
Is the waking twin hungry or just habit?: Both are common. A week of tracking usually shows it: hunger tends to settle with a feed and a longer stretch after, while habit wakings happen at similar clock times and settle without much. Ask your health visitor or doctor if you are unsure.
Will the gap ever close?: It usually narrows over weeks as the lighter sleeper matures and learns to link cycles. Growth spurts and the 4 month sleep change can widen it briefly before it settles again.
Should they share a room if one wakes so much?: Most twins can share and often sleep through each other's brief wakings. If the waking is disruptive, quick calm resettles and a steady background sound help more than separating them.

One twin sleeps through, the other is up all night

Find out what the waker actually needs

Keep their days lined up

Frequently asked questions

Sources

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