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Hi Elen,
The short answer is yes!
If your 15-month-old needs your help to fall asleep (for example, you need to lie beside your little one until they fall asleep, or if you feed/rock/bounce them until they fall asleep), then when your little one wakes between sleep cycles in their sleep space, and you’re not there, they are more likely to wake up fully and call out to you. During the day, it takes 30 – 45 minutes to complete a sleep cycle. So, they may only nap for 30 – 45 minutes.
Does that make sense?
Emma