What you describe sounds like ordinary night waking or a brief partial awakening, though the description alone isn’t enough to tell what’s causing it. Sitting or standing in the crib and crying doesn’t, by itself, mean she’s sleepwalking.

At 13 months, she may wake for several reasons:

- Children wake briefly during the night and may need help settling again. If she falls asleep with feeding, rocking, or a parent nearby, she may look for the same help when she wakes. Night feeds can be part of that pattern, but they aren’t necessarily the cause. [American Academy of Pediatrics](https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/Getting-Your-Baby-to-Sleep.aspx)
- Separation anxiety commonly disrupts sleep around this age. She may wake, notice you’re absent, and cry for reassurance. [AAP guidance](https://www.healthychildren.org/English/healthy-living/sleep/Pages/separation-anxiety-and-sleeping.aspx)
- Hunger or discomfort can also wake her, including teething, illness, or being too hot or cold. [NHS guidance](https://www.nhs.uk/baby/caring-for-a-newborn/helping-your-baby-to-sleep/)

This can happen without nightmares. Sleepwalking and night terrors involve waking incompletely from deep sleep, usually early in the night. During a typical night terror, a child looks frightened or confused, may scream or sweat, and often doesn’t recognize or respond to a parent. Because your daughter responds to your calm voice and settles, an ordinary awakening seems more likely, although a partial awakening is still possible. [AAP explanation](https://www.healthychildren.org/English/ages-stages/preschool/Pages/Nightmares-and-Night-Terrors.aspx)

Your quiet reassurance is a reasonable way to respond. Keep the lights low and interactions brief, and try to keep bedtime and naps consistent. Note when the episodes happen and how long they last, along with whether she seems to recognize you. A short video can help her pediatrician assess unusual episodes.

You don’t have to stop breastfeeding to address her sleep. If you’re considering night weaning, take her growth and daytime intake into account, along with your family’s preferences.

Talk with her pediatrician if the episodes worsen, she seems in pain, or she regularly snores loudly. Gasping, pauses in breathing, unusual stiffening, or repetitive jerking also warrant a discussion. Seek urgent help if she has difficulty breathing or is unusually unresponsive.