**This sounds most consistent with ordinary night waking and needing help settling back to sleep.** Sitting or standing and crying is not enough to identify sleepwalking. Her responding to your calm voice and quickly settling supports that interpretation, though a description alone cannot establish the cause.

At 13 months, several things can contribute:

- **Brief awakenings between sleep cycles.** If she usually falls asleep feeding or with a parent’s help, she may seek that same help when she wakes. [American Academy of Pediatrics](https://www.healthychildren.org/English/ages-stages/baby/sleep/pages/Getting-Your-Baby-to-Sleep.aspx)
- **Separation anxiety.** This can cause repeated waking and crying for a parent at this age; reassurance may be enough to settle her. [AAP guidance](https://www.healthychildren.org/English/healthy-living/sleep/Pages/Separation-Anxiety-and-Sleeping.aspx)
- **Hunger or discomfort**, including teething or illness. Night feeds may provide food, comfort, or both. Continuing breastfeeding does not by itself establish why she wakes. [NHS guidance](https://www.nhs.uk/baby/caring-for-a-newborn/helping-your-baby-to-sleep/)

**Sleepwalking or another partial awakening is possible**, but sleepwalking is more typical in older children. During sleepwalking, children often look blank or confused and respond poorly. Night terrors usually occur early in the night and involve intense distress, difficulty comforting the child, and apparent failure to recognize a parent. Her settling when you speak makes a classic night terror less likely. Nightmares can occur at this age, but nightly crying does not establish that she is having them. [AAP explanation](https://www.healthychildren.org/English/ages-stages/preschool/Pages/Nightmares-and-Night-Terrors.aspx)

Keep using the gentle reassurance that works. Maintain a consistent bedtime routine and keep nighttime interactions quiet with dim lighting. For a week, record when episodes happen, how long they last, whether she recognizes you, and whether she needs a feed. That can help her pediatrician distinguish ordinary waking from a sleep-related episode. If you want to reduce night feeds, discuss her growth and daytime intake with the pediatrician first.

Arrange a pediatric review if episodes worsen, cause injury, or accompany pain, poor growth, or daytime tiredness. **Habitual loud snoring, gasping, or breathing pauses also warrant review**, because breathing problems can repeatedly interrupt sleep. [AAP guidance on sleep problems](https://www.healthychildren.org/English/healthy-living/sleep/Pages/A-Lullaby-for-Good-Health.aspx)