Mommy, can you tell me if anyone has experienced something like this? …

Mommy, can you tell me if anyone has experienced something like this? We sleep soundly during the day, suddenly we wake up and start crying, not waking up from it, starts crying hysterically, I calm it down for a long time, if it wakes up, it starts smiling, as if it didn't cry. It mostly happens only during daytime naps. What could it be? The pediatrician didn't say anything about it. Thanks in advance for your answers)